Severe period pain, chocolate cysts, and an enlarged uterus… Understanding hormone therapy and caring for your heart

1. Endometrioma vs adenomyosis — different sites, shared pain

Direct answer: an endometrioma is an ovarian cyst with old blood and endometrium-like tissue;
adenomyosis is endometrium-like tissue inside the uterine muscle wall, which can enlarge the uterus and worsen pain/bleeding
(ACOG — Endometriosis;
MedlinePlus).

Why can period pain feel so severe?

• Both conditions respond to estrogen cycles — local inflammation and prostaglandins drive uterine/pelvic pain
• Many people have endometriosis and adenomyosis together — one drug or one surgery may not cover every symptom
• Pain intensity reflects biology and pain pathways — not personal weakness

2. Comparison table: Endometrioma vs adenomyosis

Use this education table to separate location, main symptoms, and usual care directions — not a prescription.

For education — real decisions require your gynecologist.

3. GnRH agonists = temporary “pseudo-menopause” — not permanent menopause

Direct answer:
GnRH agonists
suppress the hypothalamus–pituitary–ovary axis and lower estrogen while you take them
(sometimes called pseudo-menopause) —
not a standard goal of making menopause permanent for a time-limited course.

What to expect on therapy

• Hot flashes, night sweats, sleep disruption — from temporary hypoestrogenism
• After stopping, ovaries often resume when no other major injury is present
• Clinicians may use add-back therapy (low-dose hormones) to ease symptoms and protect bone for the planned duration
• Courses are often measured in months — not lifelong by default; plan the next step with your clinician

4. Hormone options table: GnRH / dienogest / other classes

Education comparison using class/INN names only — not a prescription.

Choice depends on contraindications, comorbidities, and fertility plans with your clinician.

If dienogest disrupts sleep, see
dienogest insomnia & side-effect care
— and see the detailed combined pill / lynestrenol / dienogest comparison in the next section.

5. Combined pill vs lynestrenol vs dienogest 2 mg — which one actually shrinks the “mass”?

Direct answer: all three can reduce pain —
ESHRE 2022
lists combined oral contraceptives (COC) and progestins among first-line hormone options.
But if the goal is a smaller chocolate cyst, the evidence is most consistent for dienogest 2 mg (partial shrinkage over 6–12 months, not in every cyst);
COC evidence on size is inconsistent, and lynestrenol has almost no size data
(Thiel 2024;
Eberle 2024).

Combined oral contraceptive (COC) — strongest for pain control and preventing post-surgery recurrence

• Placebo-controlled RCT of 100 women: period pain was milder than placebo from the first cycle (Harada 2008); a 24-week RCT against dienogest found no significant difference in pain relief (El Taha 2021)
• Cyst size: one meta-analysis found an average diameter drop of ~1.06 cm, but another found COC volume reduction not significant → the evidence is inconsistent
• After cyst surgery: with regular COC use, recurrence was 8% vs 34% without treatment (Vercellini 2013); an RCT found 24-month recurrence of 8.2% (continuous) / 14.7% (cyclic) / 29% (no treatment) (Seracchioli 2010)
• Continuous use (skipping placebo pills) may help people who still hurt during the pill-free week — adjust the regimen with your doctor
• The estrogen in contraceptive doses does not “feed” lesions in a way that stops the pill from working, because ovulation is suppressed and hormone levels stay steady — the real limits are contraindications such as migraine with aura, clot risk, or smoking at age ≥35

Lynestrenol — an older progestin that can ease pain, but with very little size data

• A long-used, low-cost 19-nortestosterone progestin that is still prescribed in Thailand
• Small RCT of 48 women: after 6 months post-surgery, lynestrenol reduced lesion scores and symptoms clearly less than a GnRH agonist (Regidor 2001) — modern RCTs are scarce
• There is no reliable evidence that it shrinks chocolate cysts — do not expect a size change
• Androgenic side effects: acne, weight gain, lipid changes, plus spotting

Dienogest 2 mg — the clearest pain and cyst-size evidence among oral options

• How it works: a progestin that causes decidualization and then atrophy of lesions, with antiproliferative and anti-inflammatory effects plus moderate ovarian suppression (estradiol falls but stays in the physiological range, often cited around 30–50 pg/mL — Klipping 2012) — it does not directly block estrogen
• Pain relief non-inferior to a GnRH agonist: pain score (VAS) fell 47.5 mm vs 46.0 mm over 24 weeks, while lumbar bone density changed +0.25% vs −4.04% (Strowitzki 2010)
• Cyst size: meta-analysis average diameter drop ~1.32 cm; a follow-up study reported average volume reductions of ~67% at 6 months and ~76% at 12 months (Vignali 2020) — averages only; some cysts barely change
• Adenomyosis: a 16-week placebo-controlled RCT showed clear pain relief (Osuga 2017), but uterine size falls slowly and modestly — one study saw a significant reduction only after 18 months (Kwon 2026)
• Thai data (62 women): pain score fell from 7.5 → 2.8 at 12 weeks → 1.9 at 24 weeks (Suwan 2026)
• Side effects: spotting (very common early), headache, breast tenderness, mood change/depression, insomnia — adolescents on long-term use should have bone density monitored

Education table — generic/class names only, not a prescription. Drug choice depends on contraindications, other conditions, and fertility plans with your own doctor.

6. How many months until the mass shrinks? — It depends on what the “mass” is

Direct answer: pain usually improves within 1–3 months; repeat ultrasound is typically done at about 3–6 months;
and endometrioma size change is most evident at 6–12 months —
in a meta-analysis, volume reduction became significant at 6 months, averaging about 55%, with large person-to-person variation
(Thiel 2024). Not every mass shrinks.

What kind of 3 cm mass is it? — This matters more than the drug name

• Endometrioma (ovarian chocolate cyst) — hormone-responsive; dienogest and GnRH have the most shrinkage data
• Adenomyosis / adenomyoma (diffuse thickening or a focal lump in the uterine wall) — hormones help pain and bleeding, but uterine size falls slowly and modestly
• Fibroid / leiomyoma — progestins do not reliably shrink fibroids (Cochrane 2020: insufficient evidence — Sangkomkamhang 2020); GnRH shrinks them temporarily, and they usually regrow after stopping
• Other masses (functional ovarian cysts, dermoids, unclear-looking masses) — hormones are not the answer; repeat imaging or referral is needed

Expected timeline on dienogest 2 mg (endometrioma)

Research figures are averages — individuals vary widely; this is not a promise of improvement.

When surgery comes back on the table

• The mass grows despite regular medication
• Suspicious or unclear ultrasound features (for example solid parts or blood flow inside the mass) — the diagnosis needs confirming, especially with older age
• Pain stays uncontrolled after adjusting medication, or side effects are intolerable
• Fertility plans: these hormones also prevent pregnancy, so they cannot be used while trying to conceive — ESHRE 2022 advises against routine cyst surgery before IVF just to improve pregnancy chances, and cyst surgery can lower ovarian reserve
• Size: no single number forces surgery — some teams use roughly 4–5 cm or rapid growth as a point to discuss surgery, while a ~3 cm cyst with symptoms controlled on medication usually starts with medication and follow-up (ESGE/ESHRE/WES 2017)

7. Spotting on progestins — how normal is it, and what to do

Direct answer: irregular bleeding or spotting is very common in the first 1–3 months of dienogest and other progestins
(in the adenomyosis RCT, almost everyone on dienogest had irregular bleeding —
Osuga 2017)
and it usually settles — it does not mean the drug is failing.

What to do in the meantime

• Take the pill at the same time every day — missed or late doses make spotting worse
• Do not stop on your own — stopping does not cause the “hormone swing and gushing bleed” people describe; it mainly lets periods and pain return, so plan any change with your doctor
• Log bleeding days, pads per day, and pain — bring this to your appointment
• Your care team may adjust the plan, for example a short NSAID course or a switch of drug — do not add or stack hormones yourself
• Some people with adenomyosis bleed heavily on dienogest (in one study 4 of 18, or 22%, stopped because of heavy bleeding — Neriishi 2018) — tell your doctor early

When to contact your doctor

• Soaking ≥1 pad per hour for 2 hours in a row
• Dizziness, palpitations, or feeling faint
• Large clots (bigger than a coin about 2.5 cm across)
• Severe new pain, or fever
• New low mood or thoughts of self-harm — one study found 36.7% had clinically significant depressive scores after 6 months of dienogest (Park 2025)

If the main problem is insomnia or mood swings from the medicine, see
dienogest insomnia & side-effect management.

8. Fertility counseling around ages 35–39 — soft, not hopeless

Direct answer: being about 35–39 with endometrioma/adenomyosis
does not equal “you can never have children.”
Chance depends on age, ovarian reserve, cyst size/side, adenomyosis severity, and prior surgery.

Reasonable talking points with your clinician

• Age affects fertility odds overall — it is not a single switch that closes every door
• ~3 cm is a common watchful-waiting example — not a universal surgery rule
• Assisted reproduction (including IVF) helps some people — not always successful and not always required
• Align timelines with a gynecologist/fertility specialist before surgery or ovulation-suppressing hormones

9. Caring for your heart — grief and fatigue from chronic pain

Direct answer: severe period pain, body uncertainty, fertility worries, and hormone side effects
can bring anxiety, sadness, or grief —
those feelings are understandable, not weakness.

• Allow grief/fear without forced positivity
• Mental-health care can sit beside gynecologic treatment
• Insomnia from pain or hormones — log symptoms for your clinician
• Thoughts of self-harm — seek emergency mental-health help immediately

Frequently asked questions (FAQ)

How do chocolate cysts (endometrioma) differ from adenomyosis?

An endometrioma is an ovarian cyst containing endometrium-like tissue and old blood (chocolate-colored). Adenomyosis is endometrium-like tissue growing inside the uterine muscle wall, which can enlarge the uterus and cause severe period pain. Both can coexist and may respond differently to hormones — separating them helps plan medicine versus surgery.

Do GnRH agonists cause permanent menopause?

Usually no. GnRH agonists suppress the hypothalamus–pituitary–ovary axis and create temporary hypoestrogenism while you are on therapy (sometimes called pseudo-menopause). After stopping, ovaries often resume function when there is no other major ovarian injury. Permanent ovarian failure is not the standard goal of a time-limited course — discuss duration, add-back therapy, and bone health with your clinician.

Why might clinicians choose dienogest for longer-term care?

Dienogest is a progestin used to suppress endometriosis symptoms and reduce dysmenorrhea in many people, often for longer courses than short GnRH-agonist blocks. Common side effects include spotting, mood changes, or insomnia — do not stop abruptly without medical advice.

Does a cyst around 3 cm always need immediate surgery?

No — about 3 cm is a common example size in watchful-waiting discussions, not a universal surgical cut-off. Decisions depend on symptoms, ultrasound features, laterality, age, and fertility plans — not a single number forcing surgery for everyone.

At about age 35–39 with endometrioma/adenomyosis, does that mean I can never have children?

Do not treat that as a hard “never.” Fertility is multifactorial: age, ovarian reserve, cyst size/side, adenomyosis severity, and prior surgery. Some conceive naturally; some need fertility care. IVF is not always successful and is not always required — discuss timing with a gynecologist or fertility specialist.

How severe does period pain need to be before I seek care promptly?

Seek care sooner if pain blocks work or school, planned pain relief fails, bleeding causes weakness, or you have fever or sudden one-sided severe pain. Collapse, breathlessness, or pain that prevents walking are emergency red flags — do not wait until suffering feels “normal.”

Are hot flashes on a GnRH agonist permanent menopause?

They usually reflect temporary low estrogen while on the drug, not automatic permanent menopause. Clinicians may use add-back therapy to ease symptoms and protect bone for the planned course. Report severe hot flashes, major insomnia, or marked mood drop.

Why does mental health matter with endometriosis/adenomyosis?

Chronic pain, fertility uncertainty, and hormone side effects can bring grief, anxiety, or low mood. Those feelings are understandable — mental-health support alongside gynecologic care is strength, not weakness, and does not replace your gynecologist.

Can a combined pill shrink a 3 cm chocolate cyst?

Sometimes, but shrinkage should not be the main expectation. The combined oral contraceptive (COC) is strongest at easing period pain and at lowering the chance a cyst comes back after surgery (8% recurrence with regular use vs 34% without treatment). Its effect on existing cyst size is inconsistent: one meta-analysis found an average diameter drop of about 1.06 cm, while another found no significant volume reduction. If the goal is a smaller mass, ask your doctor about a progestin such as dienogest 2 mg or other options.

How many months of dienogest before the cyst shrinks?

Pain usually improves within 1–3 months, repeat ultrasound is typically done at about 3–6 months, and size change is most evident at 6–12 months (one study reported average volume reductions of about 67% at 6 months and 76% at 12 months). These are averages — some cysts barely change. Spotting is common in the first 1–3 months and usually settles; do not stop the medicine without a plan from your doctor.

Scientific mechanism

Endometrioma and adenomyosis both involve estrogen-responsive tissue.
Local inflammation releases prostaglandins and cytokines that heighten uterine contraction and pain signaling.
GnRH agonists suppress pituitary gonadotropins, reducing ovarian stimulation and estrogen temporarily;
after stopping, the axis often recovers when ovarian reserve remains.

Dienogest is a 19-nortestosterone progestin that acts directly on progesterone receptors in lesions —
causing decidualization followed by gradual atrophy, with antiproliferative and anti-inflammatory effects —
and suppresses the ovaries only moderately (estradiol falls but stays in the physiological range), so it does not directly block estrogen
and causes less bone loss than GnRH agonists — which is why it is frequently used for longer monitored courses.

Combined oral contraceptives suppress ovulation, thin the lining, and lower pain-driving prostaglandins —
explaining why they relieve pain and prevent post-surgery cyst recurrence, while their effect on an existing cyst’s size is uncertain.
Fibroids are smooth-muscle tumors, not endometrium-like tissue, so they do not respond to progestins the way endometriomas do.

Written and reviewed by Asst. Prof. Dr. Norawit Raatpiboon