This is known as secondary restless legs syndrome.
In some cases, restless legs syndrome is caused by an underlying health condition, such as iron deficiency anaemia or kidney failure. Dopamine is involved in controlling muscle movement and may be responsible for the involuntary leg movements associated with restless legs syndrome. Some neurologists (specialists in treating conditions that affect the nervous system) believe the symptoms of restless legs syndrome may have something to do with how the body handles a chemical called dopamine. This known as idiopathic or primary restless legs syndrome, and it can run in families. In the majority of cases, there's no obvious cause of restless legs syndrome. In severe cases, restless legs syndrome can be very distressing and disrupt a person's daily activities. The symptoms can vary from mild to severe. Some people have the symptoms of restless legs syndrome occasionally, while others have them every day. Restless legs syndrome is also associated with involuntary jerking of the legs and arms, known as periodic limb movements in sleep (PLMS). The sensation is often worse in the evening or at night. It can also cause an unpleasant crawling or creeping sensation in the feet, calves and thighs. Restless legs syndrome, also known as Willis-Ekbom disease, is a common condition of the nervous system that causes an overwhelming, irresistible urge to move the legs.
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