Brown discharge is usually the result of a small amount of vaginal bleeding that accumulates in the vagina for a longer period of time and the blood turns brown. Brown vaginal discharge may be caused by ovulation, or by diseases such as uterine fibroids, pelvic inflammatory disease, cervicitis or cervical cancer. 1. Ovulation: When women are ovulating, vaginal discharge will increase and be thin, and some women will also experience a small amount of vaginal bleeding, which will lead to the appearance of brown discharge. 2. Uterine fibroids:The etiology of uterine fibroids is not yet clear, and it is considered to be related to genetic susceptibility, sex hormone levels and other factors. The main symptoms of patients are increased menstrual flow, irregular vaginal bleeding, pressure symptoms, and sometimes a small amount of brown vaginal discharge. 3. Pelvic inflammatory disease:Pelvic inflammatory disease is caused by bacterial and other pathogen infections, and patients will have abdominal pain, increased vaginal discharge, fever and other symptoms. In addition, a few patients with pelvic inflammatory disease will have a small amount of vaginal bleeding symptoms. 4. Cervicitis or cervical cancer:Cervicitis and cervical cancer can also lead to the phenomenon of brown vaginal discharge. When the patient has the symptom of brown vaginal discharge, it may be caused by ovulation and does not need special treatment. If it is caused by a disease, patients should consult a doctor in time and follow the doctor’s instructions for treatment.