Delayed menstruation for several months in a row, if the menstrual cycle lasts for more than 35 days and is not regular, should be considered as ovarian dysfunction or dysfunction due to non-ovulation. Follow-up sex hormone tests should be performed to monitor folliculopoietin and luteinizing hormone and compare their ratios to understand ovarian reserve function. Measurement of estradiol levels, if they are too high or too low, also indicates a decrease in ovarian reserve function. Testosterone levels are measured for hyperandrogenemia; prolactin levels are measured for hyperprolactinemia; and progesterone levels are measured for a fixed relationship with the endometrium and menstrual cycle. Through the above tests and combined with their clinical manifestations, it is important to consider whether there is polycystic ovary syndrome or other conditions such as ovarian luteal insufficiency, and to give the appropriate medication according to the specific situation.