Restless legs syndrome (RLS) affects about 5–15 percent of Americans. Many people who have RLS have family members with the disorder.
RLS can affect people of any racial or ethnic group, but the disorder is more common in people of Northern European descent. RLS affects both genders, but women are more likely to have it than men.
The number of cases of RLS rises with age. Many people who have RLS are diagnosed in middle age. People who develop RLS early in life tend to have a family history of the disorder.
People who have certain diseases or conditions or who take certain medicines are more likely to develop RLS. (For more information, go to "What Causes Restless Legs Syndrome?")
For example, pregnancy is a risk factor for RLS. It usually occurs during the last 3 months of pregnancy. The disorder usually improves or goes away after giving birth. Some women may continue to have symptoms after giving birth. Other women may develop RLS again later in life.