There are many factors that may cause menstruation to be delayed for 7 days without pregnancy, such as chronic endometritis, chronic cervicitis, endocrine disorders, polycystic ovary syndrome, etc., and you should consult a doctor in time to find out the cause of the disease. 1. Chronic endometritis: patients suffering from this disease will cause symptoms of delayed menstruation, accompanied by back pain and so on. 2. Chronic cervicitis: Chronic cervicitis can lead to upward infection and thus destroy the uterine lining, resulting in prolonged menstrual cycle and scanty menstrual flow. 3. Endocrine disorders: due to long-term bad habits, the hypothalamus will cause abnormal function, resulting in endocrine disorders, leading to delayed menstruation. 4. Polycystic Ovary Syndrome (PCOS): Due to the large amount of androgen output, estrogen is inhibited, which triggers the prolongation of the endometrial proliferation cycle, thus leading to delayed menstruation. Usually pay attention to the hygiene of private parts, and then keep a happy mood, if the menstrual period is delayed for 7 days, it is recommended to consult a doctor in time, please ask the doctor to clarify the cause of the disease, and give targeted treatment.