If the menstruation is black and there is no other discomfort such as bloating, abdominal pain, fever, etc., it is considered to be caused by poor general living habits, usually pay attention to menstrual hygiene, avoid strenuous exercise during the period, avoid sex, avoid smoking and alcohol, pay attention to avoid eating cold during the period, reasonable diet, less spicy food, pay attention to warmth, regular life, sufficient sleep, keep a happy mood, avoid constipation, etc., generally can be adjusted. If the problem is caused by organic factors, you will need to be treated accordingly.