The absence of menstruation for more than 50 days may be caused by irregular menstruation or pregnancy, which needs to be examined and treated by a gynecologist in a hospital as soon as possible. 1. Irregular menstruation: Irregular menstruation can cause delayed menstruation. If you have been overworked recently, often stay up late, or you are in menopause, you may have delayed menstruation, so it is recommended that you combine work and rest in your spare time, and maintain a good emotional state. 2. Pregnancy: After pregnancy, women will stop menstruation, and there can be early pregnancy reactions, such as nausea and vomiting, anorexia and grease, frequent urination, etc. You can use early pregnancy test paper to detect, or go to the hospital to draw blood to check the level of HCG (human chorionic gonadotropin), and ultrasound can be done to determine whether it is a normal pregnancy in 40 days of pregnancy. It is recommended that women whose periods are delayed for more than 7 days should seek medical attention as soon as possible, and if they are pregnant, they should undergo regular pregnancy tests to ensure the health of the pregnant woman and the fetus.