Most cases of irregular menstruation are caused by abnormal ovulation function, there are many ways to detect ovulation, but the most practical and convenient is to determine the basal body temperature, how to measure the basal body temperature? Generally, you have to sleep for six hours, the next day when you wake up, put the pre-sterilized thermometer under your tongue, close your mouth and measure for four minutes, write down the daily temperature, and even together there is a low and then high and low menstrual curve (the normal luteal phase is 14 plus or minus 2 days, the temperature rises 20 days mostly pregnant; less than 11 days mostly luteal deficiency, is too small follicle discharge, unfavorable to conception), such as no such changes If there is no such change, the ovulation function is mostly abnormal and the cause needs to be identified. If the menstrual cycle is long and ovulation is normal, most of the follicles are slow to develop and it is best to regulate them as well. It is important to pay attention to the long follicular phase, which means that the estrogen level lasts for too long and can easily cause breast enlargement and uterine fibroids. It is best to have a normal period once every 28 days.