Brown discharge during non-menstrual period is common in the following cases: 1. Gynecological inflammation, such as common endometritis, pelvic inflammatory disease, vaginitis, and tubal inflammation. When women suffer from gynecological inflammation, increased vascular permeability and increased inflammatory secretions can lead to brown discharge during non-menstrual periods. 2. If a woman has an intrauterine device, the device can also cause brown discharge during non-menstrual periods if the device stimulates the endometrium or when the device migrates downward. 3. If there are uterine polyps, luteal insufficiency or luteal atrophy, etc., this may also may lead to the formation of brown discharge during non-menstrual period. In this case, ultrasound, female hormone six, hysteroscopy and other related examinations should be done in time to take treatment measures according to the examination results.