Uterine polyps are growths attached to the inner wall of the uterus that extend into the uterine cavity. Overgrowth of cells in the lining of the uterus (endometrium) leads to the formation of uterine polyps, also known as endometrial polyps. These polyps are usually noncancerous (benign), although some can be cancerous or can eventually turn into cancer (precancerous polyps).

The sizes of uterine polyps range from a few millimeters — no larger than a sesame seed — to several centimeters — golf ball sized or larger. They attach to the uterine wall by a large base or a thin stalk.

You can have one or many uterine polyps. They usually stay contained within your uterus, but occasionally, they may slip down through the opening of the uterus (cervix) into your vagina. Uterine polyps most commonly occur in women who are going through or have completed menopause (peri- and postmenopausal women), although younger women can get them, too.

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Signs of uterine polyps include:

• Irregular menstrual bleeding — for example, having frequent, unpredictable periods of variable length and heaviness
• Bleeding between menstrual periods
• Excessively heavy menstrual periods
• Vaginal bleeding after menopause
• Infertility

Some women may experience only light bleeding or spotting or may even be symptom-free.

When to see a doctor

Seek medical care if you have:

• Vaginal bleeding after menopause
• Bleeding between menstrual periods
• Irregular menstrual bleeding

Source: http://www.mayoclinic.com

Although the exact cause of uterine polyps is unknown, hormonal factors appear to play a role. Uterine polyps are estrogen-sensitive, meaning that they respond to estrogen in the same way that the lining of your uterus does — growing in response to circulating estrogen.

Source: http://www.mayoclinic.com

If your doctor suspects that you have uterine polyps, he or she might perform one of the following tests or procedures:

• Transvaginal ultrasound. A slender, wand-like device placed in your vagina sends out sound waves and creates an image of your uterus, including its interior. A related procedure, known as hysterosonography (his-tur-o-suh-NOG-ruh-fee), involves having salt water (saline) injected into your uterus through a small tube threaded through your vagina and cervix. The saline expands your uterine cavity, which gives the doctor a clearer view of the inside of your uterus.
• Hysteroscopy. Doctors may perform a procedure called hysteroscopy to diagnose and treat uterine polyps. In a hysteroscopy, your doctor inserts a thin, flexible, lighted telescope (hysteroscope) through your vagina and cervix into your uterus. Hysteroscopy allows your doctor to examine the inside of your uterus and remove any polyps that are found. This eliminates the need for a follow-up procedure.
• Curettage. During curettage, your doctor uses a long metal instrument with a loop on the end to scrape the inside walls of your uterus. This may be done to collect a specimen for lab testing or to remove a polyp. Your doctor may perform curettage with the assistance of a hysteroscope, which lets your doctor view the inside of your uterus before and after the procedure.

Most uterine polyps are noncancerous (benign). However, some precancerous changes of the uterus (endometrial hyperplasia) or uterine cancers (endometrial carcinomas) appear as uterine polyps. Your doctor may send a tissue sample for lab analysis to be certain you don't have uterine cancer.

Source: http://www.mayoclinic.com

Uterine polyps may be associated with infertility. If you have uterine polyps and you experience infertility, removal of the polyps might allow you to become pregnant.

Uterine polyps also may present an increased risk of miscarriage in women who undergo in vitro fertilization (IVF). If you're considering IVF treatment and you have uterine polyps, your doctor may recommend polyp removal before embryo transfer.

Source: http://www.mayoclinic.com

Risk factors for developing uterine polyps include:

• Peri- or postmenopausal age
• High blood pressure (hypertension)
• Obesity
• Tamoxifen, a drug therapy for breast cancer

Source: http://www.mayoclinic.com