Postherpetic neuralgia (PHN) is nerve pain that continues for three months or more after a shingles rash has healed. The shingles virus (varicella-zoster, the same virus that causes chickenpox) damages the nerve as it reactivates, and the injured nerve keeps sending pain signals.

Trigeminal neuralgia causes brief, severe, electric-shock-like attacks of pain in the face, usually on one side. It involves the trigeminal nerve, which carries sensation from the face to the brain.

Meralgia paresthetica is compression of the lateral femoral cutaneous nerve, a sensory nerve that passes under a ligament near the front of the hip bone and supplies the skin of the outer thigh.

Intercostal neuralgia is nerve pain along one or more of the intercostal nerves, which run in a band beneath each rib from the spine around to the front of the chest and abdomen.

Chronic post-surgical pain is pain that develops or gets worse after surgery and lasts at least three months, beyond the expected healing time.