*Muscle fatigue
*Dehydration
*[[Magnesium ]] and/or potassium [[Potassium]] deficiency*[[Calcium ]] deficiency in pregnant women
*Malfunctioning nerves, which could be caused by a problem such as a spinal cord injury or pinched nerve in the neck or back
* as a side effect of some drugs.
== Home remedies ==
* Eat more foods high in vitamins and magnesium and calcium.