Period Dysmenorrhoea: When Period Pain Is More Than Just “Normal” Cramping

Photo by Sasun Bughdaryan on Unsplash

Period pain is so common in women of reproductive age — affecting approximately 50–90% — that it has been normalised to the point of medical dismissal. “It’s just cramps, it’s normal” is perhaps the most harmful phrase in women’s health, because while mild period pain is physiologically expected, moderate-to-severe dysmenorrhoea is not inevitable, is frequently undertreated, and when progressive or associated with other symptoms, may indicate a serious underlying condition.

Primary Dysmenorrhoea: Prostaglandin-Driven Cramping

Primary dysmenorrhoea has no identifiable structural pathology. It is caused by excessive production of prostaglandins — particularly PGF2α and PGE2 — by the shedding endometrium. These prostaglandins cause intense uterine muscle contractions (cramping), vasoconstriction of uterine blood vessels (creating ischaemic pain), and hypersensitivity of pain nerves. They also enter the systemic circulation, explaining the nausea, diarrhoea, headache, and lower back pain that often accompany dysmenorrhoea.

Characteristics of primary dysmenorrhoea: Begins within 1–2 years of menarche (when cycles become ovulatory — anovulatory cycles in the first year or two are painless). Pain begins just before or with the onset of flow, peaks in the first 24–48 hours, and resolves by day 2–3. Colicky, cramping in quality, centred in the lower abdomen, often radiating to the lower back and thighs. No identifiable structural cause on examination or imaging.

Treatment:

- NSAIDs (ibuprofen, mefenamic acid, naproxen): the most effective treatment, working by inhibiting prostaglandin synthesis at the source. Start 24–48 hours before expected onset for maximum benefit (rather than waiting for pain to begin). Regular dosing during the first 2–3 days of flow is more effective than PRN dosing.

- Combined hormonal contraceptives (COC): reduce prostaglandin production by thinning the endometrium. Dramatically improve dysmenorrhoea in most users. Can be used continuously (no placebo/break week) to eliminate periods entirely if preferred.

• Heat therapy: local heat application to the lower abdomen is as effective as ibuprofen for reducing prostaglandin-mediated cramping in multiple clinical trials.

• Exercise: regular aerobic exercise reduces prostaglandin production and increases pain tolerance through endorphin release.

Secondary Dysmenorrhoea: A Symptom of Underlying Pathology

Secondary dysmenorrhoea has an identifiable structural cause. It must be suspected when:

• Pain begins after a period of pain-free menstruation (typically in the mid-to-late 20s, unlike primary which begins shortly after menarche)

• Pain is worsening progressively over months or years

• Pain begins before the period and worsens through it rather than improving after day 1–2

• Pain is associated with deep dyspareunia (pain during intercourse)

• Pain is associated with dyschezia (pain with bowel movements during the period)

• NSAIDs that previously worked stop being effective

• Pain is accompanied by heavy flow, intermenstrual bleeding, or subfertility

The most important causes:

- Endometriosis: The leading cause of secondary dysmenorrhoea. Ectopic endometrial deposits respond to monthly hormonal cycles, causing progressive inflammatory pain that worsens over years. Endometriosis requires diagnostic laparoscopy for definitive diagnosis.

- Adenomyosis: Endometrial glands within the myometrium. Typically causes progressive worsening dysmenorrhoea from the mid-20s onwards, combined with heavy periods. MRI is the most accurate diagnostic tool.

- Fibroids: Particularly submucous and intramural fibroids that distort the cavity or increase its size, intensifying cramping.

- PID (Pelvic Inflammatory Disease): Scarring from previous PID can cause dysmenorrhoea through adhesion formation.

- Intrauterine device: Copper IUDs commonly increase dysmenorrhoea, particularly in the first 3–6 months.

The Diagnostic Gap

The average time from first symptom of endometriosis-associated dysmenorrhoea to diagnosis is 7–10 years globally — a devastating diagnostic delay often driven by normalisation of period pain. Women who present with progressively worsening dysmenorrhoea, particularly with deep dyspareunia or subfertility, deserve thorough investigation rather than continued empirical management.

At Akkineni Hospitals, dysmenorrhoea is not dismissed. We distinguish primary from secondary dysmenorrhoea through careful history and examination, appropriate investigation, and timely referral for laparoscopy when secondary causes are suspected.

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Educational content by Akkineni Hospitals. Progressive worsening period pain, especially with deep dyspareunia, deserves specialist evaluation.