From Tracee Cornforth,
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Ovarian cysts are fluid-filled sacs which are similar to blisters. Ovarian cysts are common among women during their reproductive years and are growths that form on the two almond sized organs on each side of the uterus. Most types of ovarian cysts are harmless and go away without any treatment.

What Causes Ovarian Cysts?

The normal function of the ovaries is to produce an egg each month. During the process of ovulation, a cyst-like structure called a follicle is formed inside the ovary. The mature follicle ruptures when an egg is released during ovulation. The corpus leteum forms from the empty follicle and if pregnancy does not occur, the corpus leteum dissolves. Sometimes this process does not conclude appropriately causing the most common type of ovarian cyst -- functional ovarian cysts.

Abnormal ovarian cysts such as dermoid cysts, cystadenoma cysts, endometrioma cysts, and polycystic ovarian disease often occur as the result of an imbalance of female hormones (estrogen and progesterone).

Types of Ovarian Cysts

• Functional Cysts

  These normal cysts will often shrink and disappear within two or three menstrual cycles. Because this type of cyst is formed during ovulation it rarely occurs in menopausal women because eggs are no longer being produced.

• Dermoid Cysts

  Ovarian cysts which are filled with various types of tissues including hair and skin.

• Endometrioma Cysts

  These cysts are also known as the chocolate cysts of endometriosis and form when tissue similar to the lining of the uterus attaches to the ovaries.

• Cystadenoma Cysts

  These are ovarian cysts which develop from cells on the outer surface of the ovaries

• Polycystic Ovarian Disease

  Cysts that form from a buildup of follicle cysts which cause the ovaries to thicken. These cysts cause the ovaries to enlarge and create a thick outer covering which may prevent ovulation from occurring and are often the cause of fertility problems.

What are the Symptoms of Ovarian Cysts?

Ovarian cysts often cause no symptoms; however when symptoms are present, ovarian cysts may cause a dull ache or a sense of fullness or pressure in the abdomen. Pain during intercourse and at other times can also indicate the presence of ovarian cysts.

Pain or pressure is caused by a number of factors such as size, bleeding or bursting of a cyst which irritates the abdominal tissues, or torsion (twisting of a cyst) which can block the flow of blood to the cyst.

Other symptoms of ovarian cysts which might occur include delayed, irregular, or unusually painful periods. If you experience distention of your abdomen or any other symptoms, notify your clinician immediately.