There are 2 froms.
Nf-1 is characterized by tumors on small nerves under the skin.
The worst form of this was depicted in a movie called the "elephant man". Tumors on spinal nerves can cause numness and weakness of certain arm or leg muscles. Nf-2 is characterized by brain tumors. The most common form is a tumor on both hearing nerves. Hearing loss
, dizzyness, and ringing in the ear are common symptoms of nf-2.