It's difficult to say without evaluation.
That said, there are a variety of potential causes. Neuropathy, or
nerveNerve biopsy
Nerve conduction velocity-type conditions, are possible. Obtaining
nerveNerve biopsy
Nerve conduction velocity conduction studies, in conjunction with a neurology evaluation, can be considered if this is suspected.
If a muscular cause is suspected, you can consider an evaluation by a physiatrist, or rehabilitation physician.
Metabolic causes can also lead to a cramp-type discomfort, specifically, abnormal potassium, magnesium, and calcium levels. Obtaining blood tests to exclude these causes should be considered.
These options can be discussed with your personal physician.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin Pho, M.D.
KevinMD.com
Twitter.com/kevinmd
Let me see if I can request that this be posted in another forum for you.
Tuck