What Is PCOS? Defining Polycistic Ovary Syndrome

Polycystic ovary syndrome can overlap with other diseases and conditions, many of them serious. But what is PCOS, and how is it treated?

what is pcos

What is PCOS? Polycystic ovary syndrome, which can produce such symptoms as irregular or missing menstrual periods, abnormal hair growth, obesity, and Infertility.

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It’s an obvious question to women who may be experiencing symptoms: “What is PCOS?” The short answer: polycystic ovary syndrome, a complex hormonal disorder. Because PCOS symptoms can overlap with other diseases, a woman who’s experiencing them should seek medical advice from a gynecologist.

A leading cause of infertility, PCOS is also linked to such serious diseases as endometrial cancer, diabetes, heart disease, high blood pressure, and obesity. Women with PCOS symptoms also may experience hypothyroidism, Hashimoto’s (an autoimmune disease), high cholesterol, and metabolic syndrome.

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What Is PCOS? Signs and Symptoms

The most common symptoms of polycystic ovary syndrome are:

  • Irregular or missing menstrual periods
  • Abnormal hair growth (hirsutism)
  • Obesity and difficulty losing weight
  • Infertility

Women with PCOS also report problems with depression and mood swings. Less common PCOS symptoms include heavy or long periods, thinning hair, acne, and darkening skin.

“One of the difficulties with polycystic ovary syndrome is that the outward symptoms are common and may be associated with other problems,” says Samuel S. Badalian, M.D., Ph.D., D.Med.Sc., director of the Gynecology-Urogynecology Center in Syracuse, N.Y. “In reality, a small percentage of women actually have PCOS.”

The Centers for Disease Control estimates that 6 to 10 percent of women have the syndrome.

PCOS symptoms vary, depending on age, genes (it may be hereditary), diet, and exercise. Some are more common; the American College of Obstetricians and Gynecologists (ACOG), for example, says hirsutism is seen in 70 percent of women with PCOS and that 80 percent of those diagnosed with the condition are obese. (See also our post “12 PCOS Symptoms: This Complex Disease Involves More Than Ovarian Cysts.”)


what is pcos


PCOS Screening to Diagnosis

In diagnosing polycystic ovary syndrome, your doctor will consider your family history of infertility and PCOS. He or she will likely conduct a pelvic exam and a transvaginal sonogram to look at the ovaries. Polycystic ovaries have clusters of small cysts on them that are actually immature eggs.

Blood tests to confirm PCOS symptoms may include insulin, luteinizing hormone (LH), follicle-stimulating hormone (FSH), and testosterone. Some doctors may also order tests on estrogen, glucose, dehydroepiandrosterone (DHEA), and thyroid-stimulating hormone levels.

“Diagnosis will usually be made by sonogram and the ratio of the FSH to LH,” Dr. Badalian explains. “In patients with PCOS, the FSH-LH is reversed. In a normal patient FSH is higher, but with PCOS, we see LH higher than the FSH.”

According to the Contemporary OBGyn news report “Hormone Levels and PCOS Polycystic Ovary Syndrome (PCOS)” by E. Sterling (Nov. 7, 2015), “If you have a Testosterone level of >40 nanograms per milliliter (ng/ml), DHEAS level of >200 micrograms per deciliter (ug/dl) or a LH level that is two or three times that of your FSH level (LH and FSH levels should be roughly equal), seek the advice of a specialist since there is still a good possibility you might have PCOS.”

What Is PCOS? Treatment Options

Weight control is a big factor in PCOS. Diabetes can be a serious complication, and elevated insulin production suppresses ovulation. “The anovulation can be caused by consuming too many carbs and sugars,” Dr. Badalian says. “Treatment for PCOS may include metformin, a drug commonly used for diabetes.”

Besides cutting back on carbs and sugars, even a small amount of weight loss can help regulate periods and improve cholesterol and insulin levels. ACOG recommends at least 30 minutes daily exercise to help relieve the syndrome.

For patients who do not want to become pregnant, your doctor may suggest birth-control pills containing estrogen and progestin. Birth-control pills have the added benefits of reducing hirsutism, acne, and the risk of endometrial cancer.

PCOS often goes untreated, which is unfortunate. It is usually responsive to treatment, with bothersome PCOS symptoms relieved. However, because of the many serious diseases related to PCOS, long-term health care is an important aspect of its control.


Originally published in January 2017 and updated.

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