Follicles and cysts need to do ultrasound to distinguish between the following: 1, is the first to distinguish from the examination time, the follicle is in the middle of the two menstrual period is the ovulation period, luteinized follicles after the end of menstruation in the ultrasound can not be seen. The real pathologic ovarian cysts are visible no matter what period of menstruation the ultrasound examination is done, physiological ovarian cysts after menstruation review ultrasound can not be seen. 2, is to distinguish from the size of the volume of the mature follicle volume is small diameter of 1.8-2.5 cm, if the diameter of the follicle is greater than 3.5 cm, consider the possibility of cysts, you can be differentiated in the end of the menstrual period to re-do ultrasound monitoring. If the diameter is larger than 3.5 cm, it is possible to distinguish it from a cyst by re-doing the ultrasound monitoring after menstruation. 3. Patients with ovarian cysts sometimes experience pain in the abdomen, increased leukorrhea, and some women also experience abnormal menstruation, while normal ovulation does not cause the above discomfort.