Hello,
Some of the causes:
- sitting or standing long time in one position
- vitamin b12 deficiency
- insufficient blood flow due to atherosclerosis
- alcohol and tobacco use
- herniated disk in the lower back
- underactive thyroid or diabetes
- some medications
- abnormal level of calcium, sodium, potassium
http://www.nlm.nih.gov/medlineplus/ency/article/003206.htm
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Edited by vyetimyan on September 13 2006 at 10:29pm
