The delayed menstruation of students is mainly related to the individual’s physical condition and the abnormal hormone level in the body, and other factors, generally the normal time of menstruation is around 12-14 years old. If you still do not have menstruation after the age of 18, you should consult a doctor in time to improve the ultrasound of the uterine adnexes, female hormones and other indicators, to clarify the specific causes of the disease, and if you have menstruation within the age of 18, it is a normal phenomenon, without special treatment. Usually pay attention to more rest, reduce the intake of cold drinks, ice cream, ice cream and other cold food, do not often contact with cold water or take a cold shower, because the abdomen is very easy to cold, it is easy to have dysmenorrhea, irregular menstruation, menstruation, dark, clots and other adverse consequences.