There are many reasons for non-menstrual bleeding brown without abdominal pain, which may be physiological reasons such as being in ovulation, or pathological reasons such as trichomonas vaginalis, abnormal ovarian function, etc. 1. Physiological causes: 1. Ovulatory bleeding: When you are in ovulation, the level of estrogen drops briefly, the endometrium sheds, and the bleeding is brown when the amount is small, usually without abdominal pain. Ovulatory bleeding usually occurs occasionally and the amount of bleeding is small, so it can be observed without treatment. For women with continuous ovulatory bleeding, oral medication should be taken under the guidance of a doctor to relieve the symptoms after excluding other diseases. 2. taking emergency contraceptives: women taking emergency contraceptives after unprotected sex may cause withdrawal bleeding, which may not be accompanied by abdominal pain, and generally do not need to be treated. Second, pathological causes: 1, pregnancy: non-menstrual bleeding, you can first determine whether it is related to pregnancy, if there is recent sexual life and no effective contraceptive measures, may be due to fertilized egg implantation, ectopic pregnancy or early pregnancy preterm abortion, a small amount of bleeding, showing brown, and no obvious abdominal pain, can be determined by blood HCG and ultrasound examination, if the bleeding is related to pregnancy, can be in the doctor If the bleeding is related to pregnancy, corresponding treatment can be done under the guidance of doctor. 2. Vaginal inflammation: It is common in trichomonas vaginalis, due to inflammation stimulation, there can be bleeding spots, accompanied by leucorrhea discharge, that is, non-menstrual bleeding brown, usually without abdominal pain symptoms, but with pain during intercourse, vaginal itching and other manifestations. It is mainly treated by oral antibiotics. 3. Abnormal ovarian function: If ovarian function is reduced, especially when estrogen and progesterone are insufficient, there may be brown discharge a week before menstruation or abnormal bleeding 2-3 days before menstruation, which is usually not accompanied by abdominal pain. Sex hormone therapy may be given to adjust menstruation. Pay attention to the combination of labor and rest in life and avoid overexertion; 4. Cervical diseases: such as severe cervical erosion, more severe cervical epithelial lesions, cervical cancer, etc., may also cause contact bleeding, brown in small amount, and may not have obvious abdominal pain symptoms, which can be detected by cervical screening test, and then choose drug, physical or surgical treatment according to the degree of the disease after clarification. There are many clinical causes of non-menstrual bleeding brown without abdominal pain. It is recommended to seek medical attention promptly after symptoms appear for reasonable treatment and management.