Failure to discharge menstruation for a few days may be a physiological phenomenon, or it may be a symptom of certain diseases, such as uterine adhesions, tumors, etc., and you should consult a doctor in time to find out the cause of the disease. 1. Physiological factors: such as mental tension, stress, environmental changes, etc., can affect the ovaries, leading to abnormal menstruation, usually do not need special intervention, after correcting the factors can return to normal. 2. Pathologic factors: (1) Uterine adhesion: a disease in which the uterine cavity is partially or completely occluded due to the damage of the endometrium, and the patients mainly take menstrual abnormality and cyclic abdominal pain as the main manifestations, in which menstrual abnormality mainly manifests in the decrease of menstruation, and amenorrhea can be seen in serious cases, and there may be the case that the menstruation can not be discharged for a few days when it comes. (2) Tumors: such as ovarian tumors with secretory function, pituitary microadenomas, uterine fibroids, etc., all of which can lead to abnormal menstruation, delayed menstruation, no menstruation, and menstruation not being able to be discharged for a few days. This symptom alone is not enough to diagnose the disease, and may be caused by other factors. It is recommended to consult a doctor in time to clarify the cause of the disease and give targeted treatment.