Why is the color black?

Menstruation color black, may be a normal phenomenon, but may also be related to gynecological inflammation, cold, cold, endocrine disorders, etc. Normal menstrual blood color is dark red, menstrual blood color black, may be abnormal, but if the menstrual color is black at present just came to menstruation or menstruation is about to end, this situation is normal. Because menstruation has just started or menstruation is about to end, vaginal bleeding is relatively small, a small amount of blood in the vaginal acidic environment will become black excreted. If the menstrual color black out of the current menstrual period, this situation may be related to cold and so on, need to pay attention to the belly warm, drink ginger brown sugar water and other methods to improve.