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What is endometriosis and how is it diagnosed?

Updated Sep 3, 20261 min readAnswer
On this pageShort answer What to do Common questions Related questions Sources
Short answer

Endometriosis is tissue like the uterine lining growing outside the uterus, where it inflames with each cycle - and pain is its signature.

Diagnosis starts with a pelvic exam and history; ultrasound or MRI can spot larger deposits, but laparoscopy - a minor surgical look inside - is the definitive test, because small implants hide from scans. It is usually diagnosed between ages 25 and 40.

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What to do

1Track the pain pattern.Period pain that worsens over time, pelvic pain between periods, or pain with sex are the patterns to report.
2Start with your OB-GYN.A pelvic exam and history come first; imaging follows.
3Know the limits of scans.A normal ultrasound does not rule endometriosis out - laparoscopy is the definitive test.
4Push if dismissed.Diagnosis delays of years are common; life-disrupting period pain is not something to simply endure.

Common questions

What is endometriosis and how is it diagnosed?

Endometriosis is a common condition where tissue similar to the uterine lining grows outside the uterus - on ovaries, fallopian tubes, and other pelvic surfaces - where it bleeds and inflames with each cycle. Pain is the signature symptom: very painful periods that may worsen over time, chronic low back or pelvic pain, pain during or after sex, and sometimes pain with bowel movements or urination. It is most often diagnosed between ages 25 and 40, and it can make getting pregnant harder. Diagnosis starts with a pelvic exam and history; a transvaginal ultrasound or MRI can spot larger deposits, but the definitive test is laparoscopy - a minor surgical look inside - because small implants hide from scans. The long average delay to diagnosis is real, so persistent period pain that disrupts your life is worth pushing on. Pymander, a free AI doctor available 24/7 by text, can help you document symptoms before an appointment.

About this page. Written and maintained by the Pymander Health team. Last updated September 3, 2026.

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