Women’s menstrual cycle is affected by a variety of factors. If there is a significant recent mood swing, some external stimuli, etc., there may be an occasional delay in menstruation for a month. In the case of pregnancy in women of childbearing age, a month-long absence of menstruation may also occur. In addition, some diseases may cause hormonal disorders in women, resulting in delayed menstruation. 1, endocrine disorders: If the menstrual cycle has been normal, and in recent times due to excessive mental stress, or by shock, cold stimulation, external factors leading to endocrine disorders, may cause a one-month delay in menstruation, generally by lifting the trigger, improve lifestyle habits and other ways to alleviate the symptoms. 2, pregnancy: If you are a woman of childbearing age and have a normal sex life, it may also be pregnancy-induced menopause. You should consult a doctor as soon as possible to clarify whether you are pregnant through ultrasound examination and blood sampling for HCG value; 3. Disease factors: If your menstrual cycle is disordered and the interval is often more than one month, it is an abnormal condition. You can check the hormone level to understand the ovarian condition. If there are diseases such as polycystic ovary syndrome, uterine adhesions, premature ovarian failure, etc., they may cause irregular menstruation, and the cause needs to be clarified after consultation and then treated symptomatically. In daily life, you should pay attention to improve bad habits, avoid staying up late, try not to eat too cold, spicy and stimulating food, and pay attention to keep warm during menstruation to avoid dysmenorrhea caused by cold stimulation. Keep a good state of mind, reduce bad emotions, and seek medical attention if abnormalities exist for a long time.