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There are many different causes of ovarian cysts. Under the normal menstrual cycle, ovaries grow cyst-like structures called follicles each month. These follicles produce hormones necessary for pregnancy such as estrogen and progesterone. Ovarian cysts can form when a normal follicle continues to grow for an abnormal period of time.

Follicular cysts are the most common type of cysts. They are usually harmless, rarely cause any symptoms and usually disappear on their own. Normal causes of ovarian cysts affecting the follicles take place when the pituitary gland releases hormones to trigger the release of an egg which in fact does not occur. Instead, the follicle continues to grow and develops into a cyst.

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