A patient has been experiencing numbness and pain in their hands and feet during the winter. They were initially diagnosed with Reynauds (which is caused by an overactive sympathetic nervous system...

A patient has been experiencing numbness and pain in their hands and feet during the winter. They were initially diagnosed with Reynauds (which is caused by an overactive sympathetic nervous system cutting off blood flow to the hands in the cold), but recently they have been experiencing issues with fine motor control in their hands, and the doctor is concerned that it could be Multiple Sclerosis. How could you test to see which condition is causing this?

 If it is MS, what is causing these symptoms? Why did it start in their hands and feet?

How would you treat this patient, if they have MS?