Category: Cardiology — Palpitations, arrhythmia and radiating arm pain

Palpitations, Skipped Beats and Arm Pain but a Normal ECG: Why the Test Missed It, What to Check Next, and When to Go to the ER

By
Asst. Prof. Dr. Norawit Raatpiboon
· Well Wellness Thailand / dr9ohm.com
· Last updated: September 29, 2026
· General education only — not a diagnosis or an interpretation of your own tests. Discuss your ECG results and testing plan with the doctor who looks after you.

AI Overview / Quick Answer (BLUF)

A resting ECG records only about 10 seconds, so it misses on-and-off arrhythmias and cannot rule out coronary disease. Arm pain comes from reduced heart blood flow or non-cardiac causes, not the rhythm itself.
Chest pressure over 10–15 minutes or fainting: call emergency services
(AHA/ACC 2021).

What this page covers, and what to read alongside it

This page focuses on palpitations or skipped beats with pain down the arm, but a normal ECG: why the test missed it, which monitor to wear, whether coronary testing is needed, non-cardiac causes, and symptoms that cannot wait
Holter already showed PVCs → PVCs in young adults: dangerous or not, and which tests come next
Neck pain with tingling down the arm into the fingers → Cervical radiculopathy vs office syndrome
Burning chest pressure after meals → Burning chest pain vs heart attack: spotting the emergency

A reader’s question: “Palpitations, skipped beats, pain radiating down my arm — I went to hospital and the ECG was normal. So what is it?”

“My heart races and skips on and off, and sometimes the pain radiates down my arm. I rushed to hospital, but the ECG came back normal. I still do not feel reassured and do not know what to check next.” — A composite of a comment from an arrhythmia support group, summarized

Direct answer: Going to hospital straight away was the right call, and a normal ECG is partly good news — but an ECG is a short snapshot, so it cannot fully explain what causes the palpitations or whether the arm pain comes from the heart.
The next steps are to capture the heart rhythm during symptoms with a monitor matched to how often they occur, and to assess coronary risk systematically — worrying like this is understandable, and asking further questions is not distrust of the result.

Red flags — call emergency services (1669 in Thailand) now; do not drive yourself

Direct answer: A previous normal ECG does not guarantee the next episode. With any symptom below, call emergency services or have someone take you to the ER, because it may be an acute heart attack or a dangerous rhythm.

Call emergency services / go to the ER now

Chest pressure, squeezing or heaviness lasting more than 10–15 minutes, or starting at rest and not easing with rest
Pain spreading to one or both arms, the jaw, neck or back with sweating, nausea, breathlessness or pallor
New chest pain on exertion, or pain that is more frequent, longer, or brought on by less effort
Fainting or near-fainting
Palpitations with fainting, or palpitations that start during exertion
A racing heartbeat that does not stop by itself, lasting several minutes with dizziness, chest pain or breathlessness
New breathlessness, being unable to lie flat, or struggling to catch your breath
One-sided weakness, facial droop or slurred speech — this may be a stroke, not just an arm problem
Sudden severe tearing pain through to the back — aortic dissection must be excluded
Known heart disease, diabetes or chronic kidney disease with any new symptom above — symptoms may be less obvious

While waiting for the ambulance

Sit and rest in a comfortable position, loosen tight clothing, and do not walk or drive yourself
Aspirin: chew it only if the emergency dispatcher or a doctor advises it and you are not allergic and have no abnormal bleeding — do not decide on your own or take someone else’s medicine
If the person collapses and is not breathing, start chest compressions (CPR) and get an AED as the dispatcher instructs

Not an emergency, but see a doctor soon rather than waiting for your usual appointment

Recurrent on-and-off palpitations despite a previous normal ECG — ask for a monitor matched to symptom frequency
Chest or arm pain with the same level of exertion that settles within minutes of rest — coronary assessment is needed
Tingling or shooting pain down the arm into the fingers with hand weakness or dropping things — the neck nerve roots need checking
A relative who died suddenly before age 50 or an inherited cardiomyopathy in the family — always tell your doctor

When you call, say how many minutes the chest or arm pain has lasted, which conditions you have and which medicines you take, and bring previous ECGs if you have them so doctors can compare.

Decision pathway: from symptoms now to finding the cause

Direct answer: The first question is always whether there is a red flag right now. If yes, go to the ER for repeat ECGs and troponin tests. If not, the next steps are capturing the rhythm according to symptom frequency alongside assessing coronary risk, and then treating the cause that is found.

Symptoms now or very recentIs any red flag present?

Yes, a red flagChest pressure over 10–15 minutes or at rest, arm or jaw pain with sweating, fainting, a racing heartbeat that will not stop

Call emergency services / ERSerial ECGs and repeat high-sensitivity troponin 1–3 hours apart, per protocol

No, or symptoms have settledBook a doctor visit and bring a symptom diary

Capture the rhythm by frequencyDaily → 24–48 h Holter · Weekly → 7–14 day patch or event monitor up to 30 days · Rare → loop recorder

Assess coronary riskAge, blood pressure, diabetes, cholesterol, smoking, family history, pain on exertion → coronary CT or a stress test

Treat the causeArrhythmia · coronary disease · neck nerve root · reflux · panic · thyroid or anemia

Summarized from AHA/ACC 2021, ESC 2023 and EHRA 2011 — not a diagnostic tool; the actual order of tests depends on your doctor.

1. Why the ECG was normal even though you still have palpitations and arm pain

Direct answer: A resting 12-lead ECG records only about 10 seconds. A normal ECG between episodes therefore does not exclude on-and-off arrhythmias and does not exclude coronary artery disease — although, taken during symptoms, it does make an acute heart attack much less likely
(Panju AA, JAMA 1998).

An ECG is a photo, not a video

If palpitations happen for a few minutes a day or once a week, the chance that the ECG’s 10 seconds coincide with them is very low, and if you reach hospital after the episode has passed the ECG will be normal. The EHRA position paper therefore stresses that diagnosing palpitations depends on recording the heart during symptoms
(Raviele A, Europace 2011).

On-and-off arrhythmias that a resting ECG often misses

PSVT — a fast, regular heartbeat that starts and stops abruptly, like a switch
Paroxysmal atrial fibrillation (AF) — fast and irregular; important because it raises stroke risk
PVCs and PACs — early beats felt as a skip or a flip, often coming in runs; read more in PVCs in young adults

A normal ECG does not rule out coronary disease

Many people with stable angina have a normal resting ECG, because the heart muscle is short of blood only during exertion
(ESC 2024 chronic coronary syndromes).
For acute pain, a single normal ECG does not rule out a heart attack, so the ER repeats the ECG and checks high-sensitivity troponin more than once. The ESC 2023 guideline uses 0/1 hour or 0/2 hour pathways as the main approach (some hospitals use 0/3 hours)
(Byrne RA, ESC 2023).

A JAMA review found that a normal ECG clearly lowers the likelihood of an acute heart attack (likelihood ratio 0.1–0.3) but not to zero, whereas new ST elevation raises it sharply (likelihood ratio 5.7–53.9) — so a normal ECG is “partly good news,” not the final answer
(Panju 1998).

2. How palpitations and arm pain are connected

Direct answer: An abnormal electrical rhythm does not directly cause arm pain. Cardiac arm pain comes from reduced blood flow to the heart muscle (ischemia); otherwise it comes from non-cardiac causes such as a neck nerve root —
but a heart beating very fast for a long time can cause relative (demand) ischemia and chest discomfort, especially when an artery is already narrowed
(Foreman RD, Compr Physiol 2015).

Referred pain: why an oxygen-starved heart hurts in the arm

Pain fibers from the heart travel with the sympathetic nerves and enter the upper thoracic spinal cord at about T1–T5, where they converge on the same neurons that receive signals from the chest wall and the inner (little-finger side) arm. The brain cannot tell where the signal came from, so it feels pain in the chest, arm, shoulder or jaw.
The review notes that anginal pain typically refers to the chest and upper left arm, while atypical patterns, experienced more by women, refer to the back, neck or jaw
(Foreman 2015).

How a very fast heartbeat can cause chest pain

When the heart races, for example in PSVT or rapid atrial fibrillation, it needs more oxygen, while the relaxation phase in which the coronary arteries refill becomes shorter. If an artery is already narrowed, this balance tips easily, so chest pressure or radiating pain can appear during the fast heartbeat — which is why palpitations with chest or arm pain call for checking both the rhythm and the coronary arteries, not just one of them.

Left arm, right arm, or both

Cardiac pain can spread to the left, the right, or both arms. A 1998 JAMA review found that chest pain radiating to both the left and right arm at the same time clearly raises the likelihood of a heart attack (likelihood ratio 7.1)
(Panju 1998),
and a 2005 review found likelihood ratios of 2.3–4.7 for radiation to one or both shoulders or arms, or pain on exertion, versus only 0.2–0.3 for stabbing, pleuritic, positional, or pressure-reproducible pain — yet no feature alone is strong enough to skip testing
(Swap CJ, JAMA 2005).

Atypical symptoms: women, people with diabetes, and older adults

In a registry of 434,877 people with a confirmed heart attack, 33% arrived at hospital without chest pain. This group was older (mean 74.2 vs 66.9 years), included more women and people with diabetes, arrived later, and had in-hospital mortality of 23.3% vs 9.3% — symptoms instead included breathlessness, fatigue, nausea or sweating
(Canto JG, JAMA 2000).

3. Heart or not the heart: clues from the pattern of symptoms

Direct answer: Palpitations have many causes. In a follow-up of 190 patients, the cause was cardiac in 43%, psychiatric in 31%, miscellaneous in 10% and unknown in 16%; 1-year mortality was only 1.6%, but 75% had recurrent palpitations —
non-cardiac causes are common, yet heart causes must be excluded first when risk factors are present or symptoms come with exertion
(Weber BE, Am J Med 1996).

Clue table: which patterns point to the heart and which point elsewhere

Cause	Suggestive symptoms	Arm or chest pattern	Confirmed with
Coronary narrowing or ischemia	Pressure, squeezing or heaviness on exertion or stress, easing with rest; may bring sweating, breathlessness, nausea	Radiates to the left, right or both arms, shoulders, jaw or back; diffuse, hard to point to	Serial ECGs, troponin (if acute), coronary CT or a stress test
Arrhythmia (PSVT, AF, PVC/PAC)	Racing, skipping or flip-flop beats that start and stop abruptly; may cause light-headedness	The rhythm itself does not cause arm pain; chest pain during a very fast rate suggests demand ischemia	ECG during symptoms, Holter, patch, event monitor or loop recorder
Cervical radiculopathy (C6–C8)	Neck pain that worsens when tilting or extending the neck; some feel relief resting the hand on the head	A band of pain down one arm, tingling or numbness along the fingers, possible hand weakness	Neurological examination; cervical spine MRI when indicated
Chest wall and muscles	Starts after lifting, exercise or sleeping awkwardly	Pinpoint, tender to pressure, worse with arm or trunk movement	Physical examination, after a doctor has excluded heart causes
Reflux or esophageal spasm	Burning behind the breastbone, sour burps, after meals or lying flat	Central chest tightness, sometimes rising to the throat or back; can closely mimic the heart	Exclude heart causes first, then a digestive work-up
Panic attack or over-breathing	Palpitations with intense fear, fast breathing and dizziness, peaking within minutes	Pins and needles in both hands or around the mouth; chest tightness	Assessed after physical causes are excluded
Overactive thyroid, anemia, stimulants, dehydration	Palpitations all day, heat intolerance, tremor, weight loss, or pallor and fatigue, or after caffeine, energy drinks, nicotine or alcohol	Usually no direct arm pain, but they raise the heart rate and trigger extra beats	Blood tests: CBC, TSH, electrolytes, glucose; review of drinks and medicines

Summarized from Swap 2005, Panju 1998, Weber 1996 and Iyer 2016 — clues help thinking; they do not replace testing.

Common non-cardiac causes

Cervical radiculopathy — compression of the C6–C8 roots causes neck pain with shooting pain, numbness or tingling along the arm and fingers, often linked to neck posture such as long phone use; background on cervical spondylosis (MedlinePlus), and read cervical radiculopathy vs office syndrome
Chest wall muscles and cartilage — pinpoint pain, tender to pressure, worse with movement
Acid reflux (GERD) or esophageal spasm — central chest tightness after meals, sour burps; read reflux and neck-shoulder tightness
Panic disorder and over-breathing — palpitations, tingling in both hands, fear of dying, in episodes; read panic disorder and dysautonomia
Overactive thyroid — all-day palpitations, tremor, heat intolerance, weight loss; check TSH
Anemia — the heart speeds up to compensate for low oxygen delivery; check a CBC
High caffeine intake, energy drinks, nicotine, alcohol, stimulant decongestants and dehydration — use a diary to see what comes before symptoms

4. Capturing the rhythm: match the monitor to how often symptoms occur

Direct answer: Choose by symptom frequency — daily symptoms: a 24–48 hour Holter; weekly symptoms: a 7–14 day patch or an event monitor for up to about 30 days; symptoms once a month or less: an external or implantable loop recorder
(EHRA 2011).

Daily symptoms24–48 hour Holter

Weekly symptoms7–14 day patch, or event monitor up to 30 days

Monthly or lessExternal loop recorder, or an implantable one that records for several years

Test comparison table: resting ECG vs Holter vs patch/event monitor vs loop recorder vs smartwatch vs exercise test vs coronary CT

Test	Recording duration	Best for	Limitation
Resting 12-lead ECG	About 10 seconds	Everyone with symptoms; most useful when taken during symptoms	Misses on-and-off rhythms and does not exclude coronary narrowing
Holter	24–48 hours, continuous	Symptoms almost every day, and measuring PVC burden	Often no answer if you have no symptoms while wearing it
Continuous patch or external event monitor	Patch 7–14 days; event monitor up to about 30 days	Weekly symptoms	Skin reactions to adhesive; some need a button press during symptoms; monthly-or-rarer symptoms may still be missed
Implantable loop recorder	Several years	Symptoms once a month or less, especially with fainting	A minor procedure with a small skin incision to insert the device
Smartwatch with single-lead ECG	About half a minute each time you start a reading	Capturing a clue during symptoms, such as suspected AF, then showing the file to a doctor	Can misread; cannot detect ischemia; needs a doctor to confirm
Exercise treadmill test (exercise ECG)	During exertion on a treadmill or bike, plus recovery	Symptoms that come with exertion, and rhythms triggered by exercise	Only moderate sensitivity for narrowed arteries; results can be equivocal; not for acute pain
Coronary CT angiography	Images of the arteries from a single scan	Intermediate risk, under 65 without known coronary disease	Uses contrast and radiation; needs a slow, regular heart rate; does not record the rhythm

Summarized from EHRA 2011, Zimetbaum 1998 and AHA/ACC 2021 — overview of heart tests at Heart Tests (NHLBI).

How long is worth wearing a monitor?

In a study of loop event recorders in 105 patients with palpitations, the yield was 1.04 diagnoses per patient in week 1, 0.15 in week 2 and only 0.01 from week 3 onward, so the authors recommended about 2 weeks as the standard for people with regular palpitations
(Zimetbaum PJ, Ann Intern Med 1998).

Week 1

1.04 diagnoses per patient

Week 2

0.15

Week 3 and later

0.01

The single most useful tip: get tested during an episode

If palpitations return and have not stopped, go to the nearest clinic or ER straight away for an ECG during symptoms — that tracing is worth more than repeat tests after the episode is over
Keep a symptom diary: time, what you were doing, how many minutes it lasted, fast or irregular, whether it started and stopped abruptly or faded, and any chest pain, arm pain or light-headedness
Learn to check your pulse at the wrist: count for 30 seconds, multiply by 2, and note whether it is regular
If you have a smartwatch that records an ECG, take a reading during symptoms and save the file for your doctor — but with chest pressure, call emergency services first

Questions to bring to your cardiologist

Analyze severity and receive personalized guidance from our Advisory team — take the Heart Symptom Signal Check to see whether your pattern deserves testing and how urgent it is, then bring the questions below to your cardiologist.

What should I record in a symptom diary, and what should I bring to my next visit?
Given how often my symptoms happen, should I wear a Holter, a patch, an event monitor or a loop recorder?
What is my coronary risk, and do I need ischemia testing or a coronary CT?
When I went to the ER, was troponin checked and was the ECG repeated? What were the results?
Could the arm pain come from my neck, reflux or panic, and how would we tell?
Should I have blood tests for thyroid function, anemia and electrolytes?

If chest pressure lasts more than 10–15 minutes, arm pain comes with sweating, you faint, or your heart races without stopping, call emergency services first — neither the signal check nor this checklist is a diagnosis (see the red flags that cannot wait).
Take the Heart Symptom Signal Check (free)

5. Do you need coronary tests? Testing is based on risk

Direct answer: The 2021 AHA/ACC guideline recommends risk-based testing — young people at low risk may not need more tests; for intermediate or higher risk, or pain on exertion, doctors may choose coronary CT angiography (suited to people under 65 without known coronary disease) or a stress test
(Gulati M, Circulation 2021).

Factors doctors use to estimate risk

Age, sex and the character of the pain (does it come on with exertion and ease with rest?)
High blood pressure, diabetes, high cholesterol, smoking, chronic kidney disease, and a family history of early coronary heart disease

Tests you may be offered

Coronary CT angiography — shows plaque and narrowing directly
Stress testing — exercise treadmill ECG, stress echocardiography, nuclear imaging (SPECT or PET) or stress cardiac MRI — an exercise ECG alone has only moderate sensitivity, so doctors often choose an imaging test when results are equivocal
Coronary artery calcium score — used in some people to refine risk
Echocardiogram — checks structure, valves and pumping function
Blood tests — CBC, thyroid (TSH), electrolytes, glucose or HbA1c, and lipids

In the ER, ruling out a heart attack relies on serial ECGs plus repeat high-sensitivity troponin using the ESC 2023 0/1 or 0/2 hour pathways — if you only had one ECG after your symptoms had passed, mention it at your next appointment
(ESC 2023).

6. Treatment depends on the cause that is found

Direct answer: There is no single medicine for “palpitations with arm pain” — treatment depends on the cause: arrhythmias are treated with beta-blockers or non-dihydropyridine calcium channel blockers, and PSVT is often cured by ablation; AF needs an anticoagulation decision based on the CHA2DS2-VASc score; coronary disease is treated with antiplatelets, statins and nitrates
(ACC/AHA/HRS 2015 SVT;
ACC/AHA 2023 AF).

Treatment comparison by cause: medicines (drug classes) vs procedures vs lifestyle

Cause	Medicines (class / generic)	Procedures	Lifestyle and self-care	Good to know
PSVT	Prevention with a beta-blocker or non-dihydropyridine calcium channel blocker (verapamil, diltiazem); adenosine may be used in the ER	Catheter ablation, with high success and often a cure	Vagal maneuvers taught by your doctor; cut back on stimulants	An ECG during symptoms is needed to confirm the type
Atrial fibrillation (AF)	Rate control with a beta-blocker or non-dihydropyridine CCB; rhythm control with antiarrhythmics; anticoagulants based on the CHA2DS2-VASc score	Electrical cardioversion, or pulmonary vein isolation ablation	Weight loss, less alcohol, treating sleep apnea, blood pressure control, regular exercise	The key goal is preventing stroke, not only easing palpitations
Frequent PVCs or PACs	Often no medicine; for troublesome symptoms a beta-blocker or non-dihydropyridine CCB	Ablation for a high PVC burden, symptoms despite medicines, or a weakened heart	Fewer energy drinks, less alcohol and nicotine, enough sleep	Details in the PVC guide
Coronary narrowing (angina)	Antiplatelets (such as aspirin, clopidogrel), statins, nitrates for symptom relief, beta-blockers	Angioplasty with stenting (PCI) or bypass surgery (CABG) when indicated	Stop smoking; control blood pressure, glucose and cholesterol; cardiac rehabilitation	Pain that becomes more frequent or occurs at rest is an emergency
Cervical radiculopathy	Short courses of NSAIDs (watch the stomach and kidneys); nerve-pain medicines in some people	Nerve-root steroid injection, or surgery for progressive weakness or no improvement	Physiotherapy, neck and screen posture, breaks from looking down at a phone	Most people improve without surgery
Reflux or esophageal spasm	Acid suppression with a PPI or H2 blocker, alginate raft-formers; smooth-muscle relaxants for spasm under a specialist	Endoscopy or esophageal motility testing when indicated	Smaller meals, no food for 3 hours before bed, raise the head of the bed	Heart causes must be excluded before settling on reflux
Panic attacks or over-breathing	Long-term SSRIs under a psychiatrist; avoid relying mainly on benzodiazepines	None	Cognitive behavioral therapy (CBT), slow-breathing practice, less caffeine	Diagnosed only after physical causes are excluded

Summarized from ACC/AHA/HRS 2015, ACC/AHA 2023 AF, ESC 2024 and Iyer 2016 — medicine names are generic names or classes; drug choice and dose are your doctor’s decision.

7. What you can do now, before your appointment

Direct answer: What helps your doctor most is information from during symptoms — a symptom diary, a counted pulse, an ECG taken during symptoms (from a clinic, the ER or a smartwatch file) and copies of previous results — while cutting back on obvious stimulants.

Ask for copies of your results

Every ECG you have had, plus troponin results if available
Blood tests, Holter reports or echocardiograms you have already had

Cut back on triggers you can control

Reduce energy drinks, high caffeine intake, nicotine and alcohol and see whether symptoms ease
Get enough sleep and fluids, especially on hot days or after heavy sweating
If arm pain tracks with neck posture, take breaks from looking down at phones or screens and note it for your doctor

Context in Thailand

Medical emergency: call 1669
Access to Holters, event monitors, loop recorders and coronary CT, and insurance coverage, differ between hospitals — check with your hospital

Scientific mechanism (synthesized by the author)

Synthesized by
Asst. Prof. Dr. Norawit Raatpiboon:
oxygen-starved heart muscle releases substances that activate nerve endings, such as adenosine, bradykinin and lactic acid. The pain signals travel along sensory fibers that run with the sympathetic nerves, enter the upper thoracic spinal cord at about T1–T5, and converge on the same spinothalamic neurons that receive input from the skin and muscles of the chest wall and inner arm. Because the brain is far more used to signals from the body surface than from internal organs, it interprets the pain as coming from the chest, arm or shoulder. Vagal fibers from the heart relay through the upper cervical spinal cord, which helps explain pain rising to the neck and jaw in atypical presentations.
An abnormal electrical rhythm does not itself activate these pain fibers; pain arises only when oxygen supply falls short. When the heart beats very fast, oxygen demand rises with rate and contractility, while diastole, when the coronary arteries fill, shortens. The result is relative (demand) ischemia, which becomes much more likely when an artery is already narrowed.
A resting ECG misses disease through two mechanisms. First, paroxysmal arrhythmias need a trigger, such as an early beat entering a re-entry circuit at just the right moment, which may happen only a few times a week. Second, a stable coronary narrowing can still deliver enough blood at rest, so ischemia and the ECG changes it causes appear only during exertion. Diagnosis therefore requires extending the recording window to cover symptoms, or increasing the heart’s workload under monitoring.

Frequently asked questions (FAQ)

I have palpitations and arm pain, but my ECG was normal. Does that mean my heart is definitely fine?

Not definitely. A resting ECG records only about 10 seconds, so if you had no symptoms during the test it cannot catch an arrhythmia that comes and goes, and many people with narrowed coronary arteries have a normal resting ECG. In the emergency room, a single normal ECG therefore does not rule out a heart attack; doctors repeat the ECG and check high-sensitivity troponin blood tests. The good news is that a normal ECG makes an acute heart attack much less likely, and most people with palpitations have a good outlook.

Why did the hospital ECG miss my symptoms?

Because an ECG is a snapshot of about 10 seconds, while many arrhythmias, such as PSVT, paroxysmal atrial fibrillation, or runs of PVCs and PACs, may last only a few minutes a day or happen once a week. If you reach the hospital after the episode has stopped, the ECG will look normal. That is why a longer wearable monitor matched to how often symptoms occur, or an ECG taken during an episode, is needed.

Can an irregular heartbeat cause pain down the arm?

The abnormal electrical rhythm itself does not cause arm pain. Cardiac arm pain comes from reduced blood flow to the heart muscle, which sends pain signals into the upper thoracic spinal cord together with nerves from the inner arm, so the brain feels the pain in the arm. However, a very fast heartbeat lasting a long time, such as PSVT or rapid atrial fibrillation, raises the heart’s oxygen demand and can cause chest discomfort from relative ischemia, especially when an artery is already narrowed. Palpitations together with arm pain therefore call for checking both the rhythm and the coronary arteries.

Does it matter whether the pain goes to the left arm, the right arm, or both?

Cardiac pain can spread to the left arm, the right arm, or both, not only the left. A 1998 JAMA review found that chest pain radiating to both the left and right arm at the same time clearly raises the likelihood of a heart attack (likelihood ratio 7.1). A 2005 review found that radiation to one or both shoulders or arms, or pain brought on by exertion, carries likelihood ratios of 2.3 to 4.7, while stabbing pain, pain on deep breathing, positional pain, or pain reproduced by pressing carries only 0.2 to 0.3. No single feature rules heart disease in or out on its own.

Which heart rhythm monitor should I wear?

Choose by how often symptoms happen. For symptoms almost every day, a 24 to 48 hour Holter. For weekly symptoms, a 7 to 14 day patch or an event monitor for up to about 30 days. For symptoms once a month or less, an external loop recorder or an implantable loop recorder placed under the skin that can record for several years. A study of 105 patients with loop event recorders found that most diagnoses came in the first and second weeks, with almost none after the third week.

Can a smartwatch with an ECG replace proper testing?

It can give a clue, but it cannot replace testing. A smartwatch with a single-lead ECG records about half a minute each time you start a reading. If you capture a tracing during symptoms, save or export it and show it to a doctor, because the device can misread in either direction and a single lead cannot detect heart ischemia. If you have chest pressure, do not wait for the watch; call emergency services.

Do I need tests for my coronary arteries, and which ones?

It depends on your risk and your symptoms. Under the 2021 AHA/ACC guideline, young people at low risk may not need further testing. For intermediate or higher risk, or pain on exertion, doctors may choose coronary CT angiography, which suits people under 65 without known coronary disease, or a stress test such as an exercise treadmill ECG, stress echocardiography, nuclear imaging, or stress cardiac MRI. Some people also have a coronary artery calcium score, along with an echocardiogram and basic blood tests.

If it is not my heart, what else can cause these symptoms?

Common causes are a pinched nerve in the neck (often with tingling or numbness along the fingers that worsens with neck movement), chest wall muscles (pain on pressing or moving), acid reflux or esophageal spasm, panic attacks or over-breathing (palpitations, tingling in both hands, intense fear), an overactive thyroid, anemia, and stimulants such as caffeine, energy drinks, nicotine and alcohol, as well as dehydration. A follow-up of 190 patients with palpitations found a cardiac cause in 43% and a psychiatric cause in 31%, but heart causes must be excluded first whenever risk factors are present or symptoms come with exertion.

Which symptoms mean calling emergency services right away?

Call emergency services (1669 in Thailand) and do not drive yourself if you have chest pressure or squeezing lasting more than 10 to 15 minutes or starting at rest, pain spreading to one or both arms, the jaw, or the back with sweating, nausea, breathlessness, or pallor, fainting or near-fainting, palpitations with fainting or during exertion, a racing heartbeat that does not stop by itself, or new breathlessness. People with known heart disease or diabetes who develop new symptoms, or who have a relative who died suddenly before age 50, should see a doctor sooner than usual.

E-E-A-T and academic citations

By Asst. Prof. Dr. Norawit Raatpiboon (ผศ.ดร.นรวิชญ์ ราษฎร์พิบูลย์) — synthesized from the AHA/ACC 2021, ESC 2023, ESC 2024 and EHRA 2011 guidance and PubMed research (PMIDs verified via NCBI, September 2026). Plain-language background: Heart Attack (NHLBI)

About the author · Author Hub

Medical disclaimer

This page offers general education about palpitations and arm pain when the ECG is normal —
it is not a diagnosis, an interpretation of your ECG, Holter or blood tests, or an individual treatment plan. Research figures describe groups of patients and do not predict any one person’s risk.
Medicine names on this page are generic names or drug classes, not brand names. Do not start, stop or change the dose of any medicine on your own, and do not take aspirin without advice from a doctor or the emergency dispatcher.
Procedures and coverage differ between hospitals; check with your hospital. If chest pressure lasts more than 10–15 minutes, arm or jaw pain comes with sweating, you faint, or your heart races without stopping, call emergency services (1669 in Thailand) immediately.