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.
In some cases, shingles may cause some early symptoms that develop a few days before the painful rash first appears. 1  These early symptoms can include: 2  a headache. 3  burning, tingling, numbness or itchiness of the skin in the affected area. 4  a feeling of being generally unwell. 5  a high temperature (fever)