Restless legs syndrome
Restless legs syndrome (RLS) is an unusual condition of the nervous system, characterised by the compelling need to move the legs and usually experienced when trying to sleep. The strange sensation in the calves has been described as a type of cramp, soreness or a creeping, crawling feeling. Some liken the sensation to shooting darts of electricity, or even squirming insects inside the legs. The same symptoms can also be caused by other conditions, including diabetes, iron deficiency anaemia, alcoholism and some forms of arthritis.
According to American research, around five out of every 100 people will suffer from RLS at some time. Usually, both legs are affected, but it is not uncommon to experience the unpleasant sensations in only one leg. The symptoms can be mild, moderate or severe. In severe cases, the person may be unable to sleep. No one knows what causes RLS, but it is thought to be a disorder of the nervous system. RLS can strike at any age, but it tends to first develop during adolescence.