It is hereditary and tends to run in families. It may be brought on, or made worse, by emotional factors, by injury or by infection. It may be mild or severe, be localised to one or two areas or generalised and affect the whole body. It may be stable and chronic or it may be [...] rx-med.net

Many people suffer in bed at night from painful cramps, usually involving the calf muscles or the small muscles in the sole of the foot. These cramps are not usually related to any underlying problem but are thought to be due to mechanical factors. With normal muscle tone, each group of muscles has an antagonistic [...]