--just means that many nerve are affected.

This may mean one type of nerve in many areas of the body, which is typical of many metabolic and autoimmune neuropathies, or it could mean many types of nerves (sensory and motor, myelinated and unmyelinated) are affected (more typical of toxic neuropathies).

The location can sometimes provide a clue as to cause; as Elaine mentions, asymmetric neuropathies much more prominent on one side of the body than the other imply a less systemic cause and can point to compression or mechanical injury, particularly of the spinal nerve roots. All people with neurological symptoms should probably get spinal MRI's to see if this is where the symptoms stem from, as symptoms from spinal problems can absolutely mimic those of more systemic conditions.