In clinical practice, ovarian cysts can cause irregular vaginal bleeding. It is easier to identify whether the bleeding is from ovarian cysts or vaginal bleeding caused by menstrual flow. Because menstruation is regular, for example, the previous menstrual cycle is 28-30 days, on the basis of the original, if it is 3 days earlier or 3 days later, it is normal, and the volume and color of menstruation are very similar to the previous color and volume of menstruation, and the color is dark red. Bleeding from ovarian cysts may appear as bleeding outside the menstrual cycle and may be irregular, and the color and volume are different from menstruation, the volume is relatively small and the color may be bright red.