Painful Periods or Endometriosis? How to Tell Normal Cramps From a Red Flag

Two kinds of period pain

Primary dysmenorrhea is pain caused by the uterus contracting under the influence of prostaglandins released during menstruation. It is extremely common, usually begins within a year or two of the first period, is centered low in the abdomen, starts as bleeding begins, peaks in the first day or two and fades. It responds well to NSAIDs such as ibuprofen or naproxen, to heat, and to hormonal contraception.

Secondary dysmenorrhea is period pain caused by an underlying condition. Endometriosis is the most common cause; adenomyosis, fibroids and pelvic infection are others. Secondary pain often appears or changes character later, after years of manageable periods, and comes with other symptoms.

Nine signs that point toward endometriosis

• Pain that starts one or more days before bleeding and continues after it stops.
• Pain severe enough to miss school, work or social plans, or to visit an emergency department.
• Pain that has worsened over the years rather than stayed the same.
• Little or no relief from NSAIDs taken correctly, or from the contraceptive pill.
• Pelvic pain on days when you are not menstruating, lasting six months or more.
• Deep pain during or after sex.
• Painful bowel movements, constipation or diarrhea, or bloating that worsens with your period.
• Urinary urgency, frequency or burning around your period with negative urine tests.
• A mother, sister or daughter with endometriosis, or difficulty conceiving.

The "normal" that was never normal

Many women with endometriosis have had severe period pain since adolescence and assume everyone does. They compare themselves to a mother or sister who also had severe pain, in a family where endometriosis was never named. The honest benchmark is function: if you plan your month around your period, carry prescription painkillers, or have fainted, vomited or been bedbound from period pain, you are describing a medical problem, not a personality trait.

What a good evaluation looks like

A clinician who takes period pain seriously will ask about every organ system and about the cycle, examine the pelvis, and arrange transvaginal ultrasound. If the picture fits endometriosis, current NICE and ESHRE guidelines support a clinical diagnosis and starting treatment without surgery. Being offered the pill without an explanation of what is being treated is a reasonable moment to ask: "What do you think is causing this, and could it be endometriosis?"

When to stop waiting

• You have tried NSAIDs and hormonal contraception for three months without meaningful relief.
• Your pain occurs outside your period, or with sex, bowel movements or urination.
• Your pain has escalated, or you have missed work or school because of it in the last year.
• You have been trying to conceive for a year without success, or six months if over 35.

What to bring to the appointment

A record of two or three cycles that notes pain intensity each day, the day bleeding started and stopped, painkiller use, and any pain with sex, bowel movements or urination. If you have ever been to an emergency department or missed work for period pain, note the dates. This record is the difference between "my periods hurt" and a clinical picture a specialist can act on.