Spasm : Many possible causes. If it's just that one finger, you may be developing a trigger finger which may be able to be cured or significantly helped by a properly placed steroid injection. If you are having spasms in other muscles in your body, other potential causes may be an electrolyte imbalance (potassium, calcium) or the onset of a neurological disorder, so see a doctor.
Answered 9/18/2017
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