Neuritis is inflammation of a nerve or the general inflammation of the peripheral nervous system. Symptoms depend on the nerves involved but may include pain, paresthesia (pins-and-needles), paresis (weakness), hypoesthesia (numbness), anesthesia, paralysis, wasting, and disappearance of the reflexes. Causes, Physical injury, Infection, Diphtheria, Herpes zoster (shingles), Leprosy, Lyme disease, Chemical injury such as chemotherapy Radiation therapy