Symptoms can range from numbness or tingling to pricking sensations (paresthesia) or muscle weakness. Areas of the body may become abnormally sensitive, leading to an exaggeratedly intense or distorted experience of touch (allodynia). In such cases, the pain may occur in response to a stimulus that is not normally painful. Serious symptoms may include burning pain (especially at night), muscle atrophy, paralysis, or organ or gland dysfunction.