Q:

What causes fluid buildup in the uterus?

A:

Tiny sacs of fluid that form in an ovary are known as "cysts." These cysts can be caused by complications during ovulation, endometriosis and natural causes, and are common during childbearing years, notes WebMD.

There are various types of ovarian cysts. The functional cyst is the most common and happens during ovulation. It occurs when the egg does not get released or the sac that forms the egg does not dissolve once the egg is released. Other types of cysts include polycystic ovaries, in which the sac that matures the egg fails to open; endometriosis, where tissue from the lining of the uterus grows in other parts of the body, including the ovaries; and cystadenomas, in which cysts form on the cells on the surface of the ovaries, according to WebMD.

All of these cysts are usually a normal part of a woman's menstruation period and often do not cause any pain. Cysts usually dissolve on their own in two to three menstrual cycles. However, some cysts can become large and cause the ovary to move from its original and natural position in the pelvis. This increases the chance of ovary torsion, or a painful twisting of the ovary. Also, in rarer cases, a cyst may rupture and cause severe pain and internal bleeding, explains Mayo Clinic.

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