Menstruation always one week early may be a normal phenomenon, or it may be related to psychological factors, luteal insufficiency, ovarian function decline and other factors. 1. Normal phenomenon: If the patient is always one week early relative to the 30-day menstrual cycle, that is, once every 24 days of the menstrual cycle, it is also a normal phenomenon. Generally, menstrual cycles between 21 and 35 days are normal. 2. Psychological factors: mental tension and excessive psychological pressure may lead to endocrine disorders, causing menstrual disorders and menstruation always one week early. 3. Luteal insufficiency: Luteal insufficiency refers to underdevelopment of the corpus luteum, premature degeneration, incomplete atrophy, and insufficient secretion of progesterone, resulting in poor secretion of the uterine lining and causing menstrual dysfunction, and the patient will also have their menstrual period one week early. 4. Decline in ovarian function: Ovarian function will begin to decline from the age of about 40, so it is possible that menstruation will always be one week earlier, accompanied by the shortening of the menstrual period. If the patient has menstruation one week earlier, it is recommended to go to the hospital in time for standardized treatment, so as not to threaten the health of the body.