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.

Some normal causes of ovarian cyst can be attributed to when the luteinizing hormone surges and an egg is released. Upon the release of the egg, the ruptured follicle produces estrogen and progesterone in order to prepare for possible conception. At this point, the follicle is now called the corpus luteum. What happens next is that the egg seals off and fluid accumulates inside the follicle causing the corpus luteum to expand and become a cyst.

Corpus luteum cysts usually disappear on their own without treatment within a few weeks. In the meantime, however, it can grow to nearly 4 inches in diameter. It can also bleed into itself or twist the ovary. This can cause severe pelvic and abdominal pain. Moreover, if the corpus luteum cyst fills with blood, the cyst may rupture. This can cause internal bleeding and sudden, sharp pain.

Clomiphene citrate, a commonly prescribed fertility drug to induce ovulation, might be a cause of ovarian cysts. Usage of this drug may result in an increased risk that a corpus luteum cyst might develop. Corpus luteum cysts by themselves do not pose a risk to pregnancy.

Some cysts, such as hemorrhagic or endometrioid cysts develop like other cysts but are classified as such because they contain blood. This blood can result from injury or from the leakage of blood vessels into the egg sac. Causes of ovarian cysts forming in the endometrial tissue include bleeding and sloughing off of endometrial tissue that transplants itself in the ovaries. Blood eventually builds up, rupturing and causing pelvic pain.

There are several ways to decrease the causes of ovarian cysts. The most important things you could do include, but are not limited to, get more exercise, decrease stress, eat healthy, and improve your overall health.