What could be the reason for a delay of four or five days in menstruation if not pregnant?

Patient's question:

Patient Gender: Female
Patient Age: 34
Menstruation is delayed by four or five days. What's going on? I'm not pregnant either.

Doctor's answer:

Premenstrual, a delay of one week is normal. Fatigue, medication, and endocrine changes can all cause irregular menstruation. If menstruation does not occur for more than 10 days, and pregnancy is ruled out, it should be considered menstrual disorder and an endocrine examination is needed to identify the cause. The occurrence of gynecological diseases not only affects a woman's body but can also lead to the development of gynecological diseases. Therefore, it is best to visit the gynecology department of a hospital for a gynecological examination. After identifying the cause, symptomatic treatment should be administered. Pay attention to personal hygiene and maintain cleanliness of the perineal skin in daily life.