Neuritis is inflammation of a nerve or the general infection of the peripheral nervous system. Symptoms depend upon the nerves involved but may include pain, paraesthesia (pins-and-needles), paresis (weakness), hypoesthesia (numbness), anaesthesia, paralysis, wasting, and disappearance of the reflexes. Causes, Physical harm, Infection, Diphtheria, Herpes zoster (shingles), Leprosy, Lyme disease, Chemical injury inclusive of chemotherapy Radiation therapy. The symptoms include decreased ability to sweat in the distribution of the inflamed nerve or nerves, pain and tenderness, impaired sensation, often with numbness or hypersensitivity, impaired strength and reflexes, and abnormal circulation.