This chronic condition, also known as reflex sympathetic dystrophy, is an unexplained feeling of pain and discomfort that most commonly affects an arm, leg, hand or foot. Often, it begins in the hand or foot and then spreads to affect the entire limb.

This chronic condition, which can be difficult to diagnose, results in pain throughout the body and a feeling of exhaustion that can last for months at a time. Fibromyalgia affects more women than men, and most often develops during early and middle adulthood.

This chronic condition is caused by a misfiring of the trigeminal nerve. An attack causes brief episodes of extreme, shooting pain.

This injection can both diagnose and treat pain coming from the sympathetic nerves. It is a common treatment for shingles and complex regional pain syndromes affecting the head, face, neck, or arms. Usually a series of these injections is needed to treat the problem.