Mittelschmerz (pronounced MITT-ul-shmurz) is a German word that means middle pain. This pain occurs during ovulation—the midpoint between menstrual periods, about 2 weeks before a period may begin. The discomfort can appear on either side of the lower abdomen depending on which ovary is producing the ovum (egg). Pain can be on one side of the abdomen one month and switch to the opposite side during the following cycle. About 20% of women experience this type of midcycle pain. Most of the time, it is a mild annoyance. In rare instances, it can be unbearable.
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