Brown discharge from the lower body after intercourse may be caused by menstrual flow, improper force bleeding during intercourse, cervicitis, vaginitis, etc. It needs to be handled according to the specific situation. 1. Menstrual flow: you can judge according to your menstrual cycle, if it is close to your menstrual period, it may be to have your period, you can continue to observe the bleeding volume and bleeding time without special treatment. Menstrual bleeding usually lasts 3-7 days and the bleeding volume does not exceed 80 ml; 2. Bleeding from improper force during intercourse: improper force during intercourse produces stimulation to the vaginal mucosa or cervix, resulting in a small amount of bleeding, which is manifested as vaginal brown discharge. It is recommended to rest and keep the vulva clean, bleeding symptoms can gradually disappear; 3, cervicitis: when cervicitis patients have sex, the cervical mucosa is easily damaged and brown discharge from the lower body appears, which may also be accompanied by symptoms such as lumbar and abdominal pain. If you have fixed sex partners, use condoms correctly and use antibiotics if necessary, 4. Vaginitis: stimulation of the vaginal mucosa during intercourse leads to increased inflammation and increased vaginal discharge with brown discharge as well as vaginal itching and burning sensation. The pathogens can be detected through gynecological examination and treated mainly by vaginal local medication, commonly used drugs include metronidazole, mycobacterial preparations, and fluconazole can be taken orally for women without sexual intercourse; 5, cervical cancer: the typical symptom of early cervical cancer is contact bleeding, i.e. brown discharge after intercourse, which requires TCT and HPV examination and cervical biopsy if necessary. 6. Pre-eclampsia abortion: If the patient has delayed menstruation, accompanied by early pregnancy symptoms such as vomiting and loss of appetite, and brown discharge after intercourse, the possibility of pre-eclampsia abortion cannot be ruled out, and ultrasound examination, as well as progesterone and HCG examination should be conducted in time to confirm the diagnosis and carry out fetal preservation treatment or abortion.