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.
Initial shingles symptoms are nonspecific and often lead to misdiagnosis or may be disregarded completely. The earliest shingles signs include flu-like symptoms such as headaches, light sensitivity and malaise. Next, one may feel itching, tingling, throbbing and/or quick stabs of pain a specific region of the body.