I am having numbness in my left arm for the last few days. I felt the numbness for the first time 15-20 days back. One of the doctors I went to asked me to raise both hands and smile I think the tests were ok. He then asked me to go for MRI, while he also said simultaneously that the chances of finding something in the brain is remote. I want a second opinion should I go for MRI? What could be the possible reason for this numbness? -Rajesh.