What if I haven't had my period in a month?

A month without menstruation, first of all to carry out blood or urine HCG and B ultrasound examination to determine whether there is pregnancy. Mental stimulation, weight loss, diet, strenuous exercise, taking certain drugs, hypothalamus, pituitary, ovarian tumors, pituitary infarction, premature ovarian failure, polycystic ovarian syndrome, intrauterine adhesions, endometrial tuberculosis, thyroid and adrenal tumors or dysfunction, can cause menstrual delay. First of all, we should check the reasons why menstruation does not come, try to remove some of the causes of menstruation, and then give progesterone withdrawal method to urge menstruation, and adjust menstrual cycle treatment.