Menorrhagia is usually called amenorrhea when you have stopped menstruating for 6 months. Or normal menstrual cycle is very regular, there is no menstruation for 3 months is also called amenorrhea. The general causes of amenorrhea are specifically as follows: 1. Physiological amenorrhea, such as pregnancy, lactation, menopause, which is physiological amenorrhea; 2. Stressful sudden big events in life, such as the death of someone sick in the family. Menstruation is the cerebral cortex in charge, so a high degree of anxiety and stress can cause patients not to menstruate. Menorrhagia can occur with high school exams, too much labor, and too much physical exercise. Dieting and weight loss, rapid weight loss in a short period of time, intake of nutrients can only maintain the heartbeat, breathing, gastrointestinal movements, walking, sleeping, can not meet the needs of menstruation, which can also occur; 3, drug factors, taking sedative drugs, sleep medication, or psychiatric hospital psychiatric patients eat drugs, can also occur amenorrhea. So there is no need to be nervous about amenorrhea, it is mainly from the life aspect through examination and making adjustments for the cause; 4. The hypothalamus, pituitary gland, ovaries and uterus are all part of the pathology. The pituitary gland has a pituitary tumor, which requires an MRI except for amenorrhea, and endometrial lesions can also cause amenorrhea, such as uterine adhesions can occur.