Our expert says:
Certain mechanisms within the brain and the rest of the central nervous system help regulate contraction of muscles. Interruption of these mechanisms can cause abnormal spasms. (For example Motor neurons in the nervous system that are overly sensitive may fire below their normal thresholds. The reaction of the muscle cells itself to certain chemical stimulants may be over sensitive, causing contraction without stimulation)
I think the most important things to exclude are brain tumours, stroke, multiple sclerosis, which the neurologist looked for with the MRI. Did he do an electromyography test of the nerve of the arm to see if the nerve conduction is normal?
Also If not already done - ask your GP to send you to an endocrinologist to be tested for underactivity or the parathyroid glands ? You may have too low calcium levels.
Sometimes one just has to start somewhere and look through all the possibilities until you find the piece of the puzzle that completes the picture...
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