A. A. A. Complex regional pain syndrome (CRPS), also called reflex sympathetic dystrophy syndrome, is a chronic pain condition in which high levels of nerve impulses are sent to an affected site. Experts believe that CRPS occurs as a result of dysfunction in the central or peripheral nervous systems.
Symptoms of Shingles on scalp. Nerve Pain. The first symptom of shingles outbreak is pain occurring along the path of the nerve in which varicella-zoster virus has become reactivated. The pain varies in intensity between individuals from mild to very intense.
Shingles occur in two stages: the prodromal stage and the eruptive stage. The symptoms vary depending on the stage. Prodromal Stage - This stage begins about two to seven days before the skin rash. Symptoms include numbness, tingling, burning, itching, or shooting pain on one side of the face or body.