Like many medical terms, "corpus luteum cyst" sounds scarier than it actually is. Each month, a clump of cells called the corpus luteum forms in the ovary and then disintegrates. If it fails to disintegrate, the clump turns into a cyst.
Occasionally a corpus luteum cyst will cause pain or discomfort on one side of your abdomen, or it can bleed. Most of the time, women don't know they have these cysts unless they show up on an ultrasound. In the vast majority of cases, they resolve by the 2nd trimester.
Originally published in You & Your Baby: Pregnancy.
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