Your Tango, an online blog that gives love and relationship advice for women who are single, dating, married, living together or breaking up, interviews Mark Trolice, M.D., to provide information on the causes of brown period blood.

“Women who have had Caesarean sections can have something called isthmocele, which is a lower uterine scar that collects menstrual blood and can cause dark brown flow throughout the month,” says Dr. Trolice.

Read the full article to get Dr. Trolice’s explanations on other conditions that may produce this type of blood.