Why is my period dark brown?

A person may have dark brown menstrual blood because the blood is old and has not been removed from the uterus for a while. This is a common condition, so there is no cause for alarm.

Most women experience dark brown blood at the end of the menstrual period. The flow is usually not heavy compared to the normal blood flow. Changes in the color and thickness of blood flow is usually normal, but persistent change each month could be an indication of a health problem, such as miscarriage and fibroids, as stated by WebMD. Seeking medical attention early enough is necessary.