The causes of low menstrual flow, black and sticky are as follows: 1. endocrine disorders, gynecological inflammation. 2. qi stagnation and blood stasis. 3. mental and environmental changes, cold, anemia, etc. If the cause is Qi stagnation and blood stasis, you can use medicine to nourish Qi and blood and activate blood circulation to remove blood stasis for treatment. If it is caused by endocrine disorder or gynecological inflammation, you need to go to the hospital to clarify the cause and treat it accordingly. Low menstrual flow caused by changes in the mental environment is mainly due to excessive tension or stress leading to endocrine disorders, so you should keep a relaxed and optimistic mood, pay more attention to rest and avoid staying up late, etc. If necessary, go to the hospital.