Menstruation is related to environment, stress, mental factors, and hormone levels. A part of women, in the change of season will have menstrual delay, usually delayed 7-10 days or half a month, as long as after half a month to come, is a normal phenomenon. If the period is delayed for the same amount of time every time there is a change of season, it is also normal and will not affect your health. However, if your period is delayed frequently, you should register with a gynecologist and take an endocrine hormone test on an empty stomach on the 2nd to 5th day of your period to determine if there is any abnormality in your body’s hormone levels, and then use medication to regulate your period according to the situation. If the hormone level is not abnormal, as far as possible, when the period comes, or before the period to keep a happy mood, do not overstress, eat less spicy and stimulating food, eat less cold food, to avoid causing a long delay in menstruation.