Follicles develop to 18-22mm before they are considered mature follicles, which usually takes 10-14 days. For women with regular menstruation, the day of ovulation is 14 days before the next menstrual period. Starting from the 4th-5th day of menstruation, the secretion of follicle-stimulating hormone, estrogen, luteinizing hormone and so on starts to increase, and the beginning follicle develops into a sinus follicle, and along with the increase of hormone level in the body, it goes through sinus follicle, and ultimately develops into a preovulatory follicle, which lasts for about 10 days. However, due to external factors, such as emotions, weather, or hormone level disorders, the follicle development time has individual differences, and some patients even have follicles that do not develop to maturity. If you have abnormal follicle development, you need to consult a doctor in time to identify the cause of the disease and then treat the symptoms. Eat more vegetables, fruits and protein-rich foods.