Mittelschmerz is midcycle abdominal pain related to ovulation (Charlewood, 1958). It happens in 20% of females in the fertile age group, and typically occurs at the site of the ovaries on the side where the ova is released (Krohn, 1949). The exact cause of pain is still debated but it may have some link with the release of serosanguinous fluid causing peritoneal irritation.
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Durai et al. (2009) studied this question.
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