The cause is not known and could be seen in association with pregnancy, obesity, smoking, iron deficiency anemia, polyneuropathy associated with hypothyroidism, hormonal disorders like diabetes, kidney failure, drugs like caffeine, zantac and anti depressants like elavil. Treatment involves
iron deficiency lookout
and its treatment. Stop using caffeine
and alcohol,
and exercise to get adequate sleep may help. Drugs used are oral magnesium, carbamazepine, diazepam, baclofen, bromocriptine, etc.