Menstruation that has not ended after half a month with a lot of blood clots may be caused by organic lesions of the reproductive system, such as uterine fibroids, endometrial polyps or endometrial cancer, etc., and it may also be caused by endocrine abnormalities. 1. Organic lesions of the reproductive system: when a woman suffers from uterine fibroids, adenomyoma, endometrial polyps or endometrial cancer, she will have irregular menstruation and increased menstrual flow, which needs to be treated under the guidance of doctor after the cause is clarified. 2. Endocrine abnormality: When women stay up late, live an irregular life, get cold or take hormone drugs, it may cause endocrine abnormality, which may lead to irregular menstruation, prolonged menstruation with blood clots. This situation needs to be adjusted in daily life, relax, pay attention to warmth during menstruation, avoid staying up all night, etc., if necessary, need to be treated with medication under the guidance of a doctor. It is recommended that patients go to the hospital in time for examination, to clarify the cause of the disease, under the guidance of the doctor for targeted treatment, so as to avoid delaying the condition.