Ovarian cysts form on or inside ovaries, and can be the result of various causes. Symptom #5: Problems Urinating And Defecating. The exact cause is unknown, but it involves a hormone … An ovarian cyst is an enclosed sac-like structure filled with fluid or semi-solid material located in the ovary. You may be at higher risk for a ruptured ovarian cyst if you have polycystic ovarian syndrome (PCOS). Morgan Swofford for LittleThings. Ovarian cysts can cause breast tenderness, and an aching pain in the thighs and lower back. Simple cysts are the most common and are a result of the menstrual cycle. Ovarian cysts can vary in size. Though most ovarian cysts are benign, some are cancerous. Taking fertility drugs often causes the development of multiple follicles (cysts) in the ovaries. Ovarian cysts are more common in the childbearing years between puberty and menopause. Most of the time, they are painless and cancer-free. All ovarian cysts, however, fall under one of the following categories: simple cysts or complex cysts. Ovarian cysts are very common and can arise due to a number of causes. Ovarian cysts form in or on a female’s ovaries as fluid-filled sacs. Any of the following can lead to a ruptured cyst: Hormone changes around the time of your monthly period; Pressure on the cyst from sports, sex, or an injury to the area (usually large cysts) Pregnancy Here's what you need to know, according to ob-gyns, about ovarian cyst causes and types of ovarian cysts. PCOS causes many cysts to grow on your ovary. Like with uterine fibroids, ovarian cysts can cause a feeling a heaviness in the abdomen. Polycystic ovary syndrome is a condition that causes many small, simple ovarian cysts. Ovaries — Most ovarian cysts are simple cysts that don't require specific treatment. Expanding or ruptured cysts that cause pelvic pain are treated with oral pain relievers. Vaginal (pelvic) ultrasound can be used to reveal the presence of ovarian cysts. Ovarian cysts often cause no symptoms; however, when symptoms are present, you may notice a sharp or dull ache that may come and go or a sense of bloating or pressure in the lower abdomen. Many are very small, while cysts associated with ovarian tumors may be 12 inches or more in diameter. Large or ruptured ovarian cysts can cause symptoms including pain, pelvic pressure, or discomfort. Pregnancy, endometriosis, and your typical menstrual cycle can all be causes of ovarian cysts.   Learn about the symptoms, treatment options, and outlook for ovarian cysts and ovarian cancer. Ovarian cysts are associated with an increased risk of cancer when they occur after menopause. If the cyst is very large, your doctor can use a needle to remove the fluid from the cyst and/or inject corticosteroid medication into the cyst or knee. The condition is less common after menopause. 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