The first period after abortion may be due to mental factors triggered by the physiological phenomenon, may also be the endometrial damage, uterine cavity adhesion and other conditions. 1. Mental factors: usually patients after abortion surgery, the first time the amount of menstruation is small, dark, may be due to the recent often in nervousness, anxiety and other adverse emotions, affecting the body endocrine caused by normal physiological phenomena, most of which can be returned to normal in 3 months after surgery. 2. Endometrial damage: abortion surgery may lead to endometrial damage, which will affect the patient’s menstrual flow, appearing low menstrual flow, dark color. 3. Uterine adhesion: If the patient has uterine adhesion after abortion, it will lead to poor menstrual blood flow, which may also lead to reduced menstrual flow and dark-colored menstrual blood. Patients need to rest for 2 weeks after the operation and avoid heavy physical activities. Patients with abnormal menstruation after abortion should be diagnosed with diseases after eliminating physiological factors, and should be treated actively.