There are several cases of brown discharge from the vagina: 1. If there is brown discharge from the vagina before menstruation, there is a little bit of bleeding before the onset of menstruation and not much bleeding before brown liquid is formed. 2. There may also be brown discharge near the end of menstruation, when menstrual bleeding is less and stays in the vagina for a longer time to form brown. 3. The brown discharge may be affected by cervical inflammation or celiac disease. 4. A small amount of bleeding may occur during ovulation, and the brown color may form in the vagina after a long time, which may be caused by a drop in progesterone levels due to endocrine disorders.