Some people’s menstruation may be delayed depending on psychological, such as poor mental state, and may be delayed due to psychological stress. Sometimes when the weather is hot or cold and changes quickly, the patient’s menstruation may also be delayed. However, if the delay is due to cold weather, and if the patient has no sexual intercourse during ovulation or is using contraception to exclude the possibility of pregnancy, then the delay is related to the cold weather. This is the general outside factor that may cause a delay in the menstrual cycle.