Carpal Tunnel Syndrome
Nerve compression at the wrist causes numbness and tingling of the hand and arm.
Carpal tunnel syndrome can cause tingling, numbness, weakness, or pain in the fingers or hand; some complain of pain in the arm between the elbow and hand. Symptoms most often occur in the thumb, index finger, middle finger, and half of the ring finger. If you have problems with your other fingers but your little finger is fine, this may be a sign that you have carpal tunnel syndrome because a different nerve leads to the pinkie.
Ulnar Nerve Entrapment
Nerve compression in the arm occurs when the ulnar nerve which travels from the neck to the hand becomes pinched somewhere along the way- most commonly at the elbow or wrist.
Characteristics of a problem with the ulnar nerve include weakness or tenderness in the hand, tingling in the palm and ring and pinkie fingers, sensitivity to cold, and tenderness in the elbow joint.
A Genetic disorder that causes tumors to form in nerve tissue anywhere in the nervous system.
There are three types of neurofibromatosis, each with different signs and symptoms. For more details please visit this link.