Mittelschmerz

Alternative names:

midcycle pain; ovulation pain

Definition:

One-sided lower abdominal pain that occurs in women at or around the time of ovulation.

Causes, incidence, and risk factors:

There are several explanations for the cause of ovulation pain. The pain may occur just before, during, or after ovulation. Just prior to ovulation, follicle growth may stretch the surface of the ovary causing pain. At the time of ovulation, fluid or blood is released from the ruptured egg follicle and may cause irritation of the abdominal lining. About 20% of women experience ovulation pain. It may be felt on one side one month, then switch to the opposite side, or it may be felt on the same side for several months in succession.