Neuritis is specific inflammation of a nerve or general inflammation of the peripheral nervous system, which consists of the ganglia (nerve cell clusters) and nerves outside of the brain and spinal cord. Nerves span the entire body, so typically neuritis is associated with an area of the body. For example, brachial neuritis is inflammation of the arm nerves. Depending on location, symptoms of neuritis include pain, a pins-and-needles-like sensation, weakness, numbness, gait abnormalities, and impaired reflexes. Causes of neuritis include physical or chemical injury, and infection (such as herpes or Lyme disease). There is also a wide array of underlying conditions that can cause forms of neuritis. These include diabetes, cancer, vitamin deficiencies, hypothyroidism, and diphtheria. Treatment for neuritis typically includes corticosteroid therapy. Medical professionals may also recommend a vitamin regimen and dietary changes. In non-severe cases, recovery usually occurs rapidly. Occupational and physical therapists can also assist with neuritis treatment and/or recovery by providing strengthening exercises for weakened muscles, gait training, footwear consultation, massage, and balance activities.