A woman who experiences abnormally long periods is likely suffering with menorrhagia, which can also be accompanied by heavy bleeding, explains Healthline. Causes of menorrhagia include hormonal imbalances, thyroid complications, endometriosis, uterine polyps or fibroids, pelvic inflammatory disease, and certain inherited bleeding disorders that prevent blood clotting.
Women should pay attention to how long their periods last each month, according to Healthline. If a woman consistently bleeds for more than four to five days each month without irregularities, this may be normal for her and does not necessarily indicate that she has an underlying health condition. The main concern with prolonged bleeding is the consistent loss of blood, which can lead to anemia.