I agree that the best thing to do is to go see a Doctor. However, there are far less serious things that it could be, such as: tennis elbow (tendinitis of your anterior tendon that goes from the outside of your elbow to your middle and ring fingers), golf elbow (tendinitis of your posterior tendon that goes from the inside of your elbow to the ring and pinky fingers, some other kind of tendinitis. . . I have even heard of a broken collar bone leading to complete inability to pick things up and curling / cramping of the finger, hand and forearm muscles.
Again, the best bet is to see a Doctor right away. If you do not have health insurance, go to a free clinic and wait in line.
For ANY of these injuries, treatment for the actual injury is a must first, then exercises to strengthen muscles around the injury should be strictly adhered to. I have had tendinitis in my right arm for quite a while and the only thing that works is muscle strengthening and ice for me.
If it happens to be MS or a stroke, then the treatment will be much more intensive. Go see a Doctor now!
Numbness and tingling in the hand and arm can be caused by a range of things including pressure on a nerve, stroke, multiple sclerosis and diabetes. The best way to treat it would be to visit your doctor to determine what is causing it.
There are numerous causes. Among them are injury to a nerve, pressure on the spinal nerves, lack of blood supply. Other medical conditions including carpal tunnel syndrome, diabetes, migraines or stroke. The best thing you can do is go see your doctor and explain the symptoms to him.