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As often as not, no cause is found for leg cramps, even after substantial testing and examination. They can be caused by medications, by nerve damage, osteoporosis, diabetes and other endocrine diseases, dehydration, and about 40 other things. Just aging is one possible cause. Leg cramps increase in frequency as one ages.
Straightening the affected leg along with massage can help relax the muscle spams. Ice applied afterward can help with bruising of the muscle fibers.
Making sure you have sufficient fluids can also help if dehydration is a cause. Your primary provider would need to check medications and electrolyte levels to see if that could be part of the problem.
Please let me know if you have questions.