Menstrual blood black in gynecology for common diseases, the reasons are as follows: 1, a kind of cold body women, the body originally due to cold and blood is not smooth, before the menstrual cold, cold, so the menstrual blood color is dark or black, menstruation must pay attention to keep warm, menstruation more brown sugar water, avoid touching cold water, diet can not eat cold fruits and food. 2, organic lesions caused when women suffer from some gynecological diseases, such as When women suffer from some gynecological diseases, such as pelvic inflammatory disease, cervicitis and other diseases, because the reproductive system has problems, will also appear menstrual blood black this situation. For gynecological inflammation caused by black menstrual blood, you should go to the hospital in time to improve the examination, symptomatic treatment, usually always pay attention to the body abnormalities, small problems to early detection and early treatment.