There are more causes of low menstrual flow and long menstrual periods, mainly including lack of qi and blood, menstrual strain, mental stress, gynecological inflammation, luteal insufficiency, endocrine disorders, uterine pathology and other conditions, which cannot be generalized. Normally, the normal menstrual volume is 20-80ml. If the menstrual blood is less than 20ml, it indicates a low menstrual volume. The normal period is 3-7 days, more than 7 days indicates a long period. If the low menstrual volume and long period occur once in a while, you can observe on your own first, except for the influence of factors such as exertion, emotion or mental stress. If menstruation is frequent, it is advisable to go to the hospital in time to test for abnormal hormone levels, as well as to check for organic lesions in the reproductive system through gynecological examination and gynecological ultrasound. There are many factors that affect menstruation, it is recommended that women should pay attention to rest, can relieve stress through appropriate exercise, and should eat warm food and avoid contact with cold water during menstruation.