If menstruation is delayed for 10 days, it is often due to the following reasons: 1, due to mental overstress, stress, anxiety, emotional instability or sudden changes in the environment, which often leads to endocrine disorders, thus delaying menstruation. 2, due to certain diseases, for example, polycystic ovary syndrome often prolongs the menstrual cycle, which can be detected by ultrasound, and the androgens may increase. 3, taking certain drugs can cause delayed menstruation, such as taking progesterone or contraceptives, all of which may lead to androgens. Polycystic changes, and sex hormone six blood test will find that androgens may be increased. 3, taking some kind of drugs will lead to delayed menstruation, such as taking progesterone or contraceptive drugs, may lead to delayed menstruation. So delayed menstruation if it is once in a while, you can not need to check, after the development of good habits, this symptom will often disappear. If the menstruation is delayed frequently, it is recommended to draw blood to check the sex hormone six items, and ultrasound examination is needed at the same time.