Multiple follicles are seen in the ovaries, as follows: 1. Pathological factors: If more than 12 echogenic areas, or follicles, of 2-9 mm in diameter are seen on ultrasound imaging on one or both ovaries, and the ovaries have increased in size, this condition is mostly considered pathological polycystic ovaries. If a woman has menstrual changes or clinical and biochemical features of hyperandrogenemia, the diagnosis of polycystic ovary syndrome is usually made, which is a chronic endocrine disorder with multisystemic changes. Most polycystic ovary syndrome causes menstrual abnormalities, manifesting as delayed menstruation or amenorrhea, which can lead to persistent non-ovulation in women. 2. Physiological factors: multiple follicles can be seen in the ovaries, and if the number of follicles is 3-11, and there is a dominant follicle, that is, one of the follicles should develop bigger, this is mostly a physiological phenomenon. In a normal woman, there are 3-11 follicles developing at the same time during her menstrual cycle, starting from the 5th to 7th day of menstruation, but only one follicle will grow into the dominant follicle and expel the egg. During the development of these 3-11 follicles, sometimes you may be able to see multiple follicular changes under the ultrasound.