Normally, a girl’s menstrual cycle is from 21 to 35 days, with an average of 28 days, but the length of each person’s menstrual cycle varies, and the time of the onset of menstruation is not fixed for some girls each month, sometimes it is early and sometimes it is delayed. Therefore, in general, a delay in menstruation of no more than 7 days can be considered normal and not too worrying. However, if your period is more than 7 days later than usual, it is a real delay in your period. What are the reasons for delayed periods other than the possibility of pregnancy?1. Excessive mental stress. Menstruation is regulated by the hypothalamus-pituitary-ovarian axis mechanism in our body, and greater mental and psychological stress can affect the regulatory function of the mechanism. The greater the mental stress, the more afraid the “aunt” will be, and the more afraid she will be, the more she will not dare to come; 2. Bad lifestyle habits. Each of the bad habits that you can’t give up, such as staying up late, smoking and drinking, dieting or overeating, will inadvertently turn away your “period”; 3. The influence of drugs. If you’re looking for the pill, it will inhibit ovarian function, so your period will be delayed. Of course, other medications besides birth control pills may also affect the timing of menstruation. Therefore, if you do take drugs recently, but are not sure if it will affect your period, it is recommended to consult your doctor; 4. Influence of disease. Diseases such as premature ovarian failure, polycystic ovary syndrome, diabetes, hypothyroidism, etc. can interfere with the endocrine function in our body and most likely cause delayed menstruation. If you don’t want to scare yourself because your period is always late, why not start now: calm your mind, sleep early, quit smoking and drinking, dieting and overeating!