Causes of ovarian cysts are many. During a normal menstrual cycle, the ovaries develop follicles each month. Estrogen and progesterone, two hormones which support pregnancy, are produced by these follicles. If a normal follicle continues growing for an extended period of time ovarian cysts can result.

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.

Frequent causes of ovarian cysts occur when luteinizing hormones surge and an egg is release. When the egg is released, estrogen and progesterone are created by the ruptured follicle to prepare for the hypothetical conception. When the egg is sealed off, fluid accumulates inside the follicle and becomes what is called a corpus luteum. The corpus luteum will then expand and at that point becomes 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.

It is important to note that the fertility drug clomiphene citrate, which is commonly used to induce ovulation, might be one of the causes of ovarian cysts, since it can often increase the risk of the development of a corpus luteum cyst. Corpus luteum cysts do not prevent or threaten 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.

Though it is not possible to completely prevent the causes of ovarian cysts, increasing exercise, controlling stress, improving the quality of your diet, and improving your health can help minimize the probability of the development of an ovarian cyst.