👉 Hysterorrhexis is a medical condition that occurs when the uterus, or womb, becomes too large and obstructs blood flow to the baby. This can cause pain and discomfort during pregnancy, as well as lead to miscarriage, which is a loss of a fetus. The exact cause of hysterorrhexis may not be fully understood but it often involves an abnormal growth of the uterus, called an endometriosis. Endometriosis is a condition where tissue from the lining of