Small amount of bleeding during non-menstrual period is considered to be related to ovulation bleeding, pelvic inflammation, endometrial polyp and other factors. It is recommended to do relevant examinations in time to clarify the diagnosis and give appropriate treatment according to the doctor’s instructions. 1. Ovulation bleeding: As the hormone levels in the body will change drastically during the ovulation period, the endometrium of some women will cause some reactions to the drastically fluctuating hormone levels, which will lead to a small amount of bleeding in the endometrium, also known as ovulation bleeding. This kind of bleeding is usually small and will get better on its own without special treatment. 2. Pelvic inflammatory disease: a common infectious disease of the upper reproductive tract of women, the body’s immune function, endocrine changes, exogenous pathogenic bacteria invasion can lead to inflammation, the clinical manifestations of pain in the lower abdomen, fever, abnormal vaginal secretions increase, or abnormal vaginal bleeding and other symptoms. 3. Endometrial polyps: overgrowth of endometrial mesenchyme covered with benign endometrial glands, which may be related to high estrogen level, inflammation and other factors. Most of them are benign, but a few of them can be malignant, which mostly manifested as abnormal uterine bleeding, abnormal menstruation and other symptoms. 4. Other factors: such as tumors, taking certain drugs, wearing IUD, blood diseases and other factors can lead to non-menstrual bleeding. Therefore, if there is a small amount of bleeding during non-menstrual period, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease and follow the doctor’s instructions to deal with the treatment.