Restless legs syndrome (RLS) is a disorder that causes a strong urge to move your legs. This urge to move often occurs with strange and unpleasant feelings in your legs. Moving your legs relieves the urge and the unpleasant feelings.
People who have RLS describe the unpleasant feelings as creeping, crawling, pulling, itching, tingling, burning, aching, or electric shocks. Sometimes, these feelings also occur in the arms.
The urge to move and unpleasant feelings happen when you’re resting and inactive. Thus, they tend to be worse in the evening and at night.
RLS can make it hard to fall asleep and stay asleep. It may make you feel tired and sleepy during the day. This can make it hard to learn, work, and do other daily activities. Not getting enough sleep also can cause depression, mood swings, or other health problems.
RLS can range from mild to severe based on:
One type of RLS usually starts early in life (before 45 years of age) and tends to run in families. It may even start in childhood. Once this type of RLS starts, it usually lasts for the rest of your life. Over time, symptoms slowly get worse and occur more often. If you have a mild case, you may have long periods with no symptoms.
Another type of RLS usually starts later in life (after 45 years of age). It generally doesn’t run in families. This type of RLS tends to have a more abrupt onset. The symptoms usually don’t get worse over time.
Some diseases, conditions, and medicines may trigger RLS. For example, the disorder has been linked to kidney failure, Parkinson’s disease, diabetes, rheumatoid arthritis, pregnancy, and iron deficiency. When a disease, condition, or medicine causes RLS, the symptoms usually start suddenly.
Medical conditions or medicines often cause or worsen the type of RLS that starts later in life.