A 5-day delay in menstruation is normal. The normal menstrual cycle is about 28 days, and it is normal to have a week early or delayed. If a woman has a history of sexual intercourse and her period is delayed, the first thing to do is to rule out the possibility of early pregnancy. It is recommended to go to the hospital for an ultrasound and blood hCG test to clarify whether she is pregnant. If this happens only once in a while, treatment is usually not needed and observation is recommended. It is also normal if there is a fixed cycle with a delay of 5 days every time. However, if the period is sometimes early and sometimes late, it is considered to be due to an endocrine disorder, which requires prompt treatment. Ultrasound examination can be performed to check the thickness of the endometrium and the uniformity of the endometrial echogenicity, as well as the sex hormone test to determine whether there is any endocrine abnormality in women. If your period is delayed for 5 days, you do not need to be too nervous, you can observe it first. However, if the delayed menstruation is accompanied by other uncomfortable symptoms, if there is a combination of change in the volume of menstruation, too much or too little menstruation, change in the period, too long or too short period, you need to go to the gynecology department in time.