A delay of eight days is an irregularity in menstruation, and a delay or advance of up to one week is usually normal. If a woman of childbearing age experiences an eight-day delay in her period and is not using contraception, she should consider whether pregnancy is the cause. If pregnancy is not the cause, the occasional delay of eight days can be observed without treatment for the time being. Delayed menstruation may be related to unpleasant mood or staying up late, consuming cold food before menstruation, etc. Therefore, if there is no special discomfort, it can be observed for the time being. Generally relax, may also be the aunt will come on their own, most women have delayed menstruation, in life, pay attention to keep warm, pay attention to before and after menstruation can not be angry, can not stay up all night, work and rest time should be regular and so on.