There are various reasons for brown menstruation and low volume. A menstrual volume of 50-80ml is normal, less than 30ml is a low menstrual period for the following reasons: First, there are endocrine disorders, such as luteal insufficiency, low ovarian secretion of hormones leading to a thin endometrium, and hypothyroidism can occur with brown menstruation and low volume. Secondly, patients with multiple abortions or uterine operations, such as ectopic pregnancy, intrauterine pregnancy, pre-eclampsia or the process of spontaneous abortion, will have brown menstruation and low volume. Vaginitis, cervicitis, endometrial polyps, and cervical cancer can also cause brown and scanty periods, as can patients with a history of tuberculosis. The causes of brown menstruation and low menstrual flow are multifaceted. Do the relevant examination under the guidance of a doctor according to the specific cause, and then treat the symptoms, pay attention to personal hygiene during treatment, keep the vulva clean and dry, and avoid straining.