Why do i have numbness in my right hand and arm sometimes? it stop for weeks and then start back. i can't hold anything in my hand.

Numbness: Numbness could be caused by several possibilities. Carpal tunnel syndrome(cts) where the median nerve is trapped at the wrist, or due to cervical spinal nerve entrapment due to a disc or osteophyte (spur). Cts should not give you numbness in the arm (just in the hand and first three fingers). However, pain may be felt up to the forearm as well. Check with your physician for adequate diagnosis.