Why does ovarian endometrioma cause painful periods?

An ovarian endometrioma is a cyst containing old blood and tissue linked with endometriosis. Around a period, hormone-responsive tissue can become inflamed. Swelling stretches the ovarian surface, while irritation may affect nearby pelvic tissue. These changes can produce cramping, deep pelvic aching, or pain that radiates into the lower back. Scar tissue can also limit how freely the ovary and surrounding organs move.

Pain may build before bleeding starts, become stronger during the period, or continue after the flow has ended. Severity can vary with the cyst's position, associated endometriosis, and individual sensitivity. Painful periods have other possible causes, so the symptom alone cannot identify an endometrioma.

Record when pain begins, where it is felt, how long it lasts, and whether bleeding, bowel movements, sex, or urination make it worse. A clinician may assess your history, examine you, and use pelvic imaging to look for an endometrioma or other cause. Treatment may include pain relief, hormone-based treatment, monitoring, or surgery depending on symptoms, cyst features, fertility plans, and examination findings.

Use medicines only as directed and tell the clinician about pregnancy possibility, stomach problems, kidney disease, or other medicines. Heat over the lower abdomen and gentle activity may ease cramping for some people, but should not delay assessment when pain is new or severe.

Arrange medical review for period pain that is worsening, interrupts daily activities, returns despite treatment, or occurs with difficulty becoming pregnant. Seek urgent care for sudden severe pelvic pain, fainting, marked weakness, fever, repeated vomiting, or a swollen tender abdomen. These symptoms can signal a complication or another urgent pelvic condition.

Ask whether imaging suggests an ovarian endometrioma, what other causes of painful periods should be considered, and how treatment may affect fertility. You can also ask which pain medicines fit your health history, what symptoms should prompt urgent help, and when follow-up imaging or review is needed.