Women who find blood on their underwear should not be too nervous, to determine whether it is the onset of menstruation, women in the age of 12-16 years old will come to menstruation, individual will be slightly earlier or later, menstruation lasts for more than 3-7 days to the end. If a woman has normal menstruation and there is blood in her underwear during the non-menstrual period, it is considered to be ovulation bleeding, and the amount of blood is usually small, and will disappear in 2-3 days, which is normal and does not require special treatment. If you suffer from cervical erosion, cervical polyps or even cervical cancer and other diseases, vaginal bleeding can also occur and require timely specialist treatment. Of course, in addition to gynecological diseases, but also to consider the anal and intestinal diseases, such as hemorrhoids, anal fissure, and perianal abscess, etc., if the bleeding is not wiped clean, but also stained in the underwear, the need for anal and intestinal surgical consultation to be symptomatic treatment.