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Health A-Z

What is arachnoiditis?

Arachnoiditis is a rare pain disorder caused by inflammation (swelling) of the arachnoid, one of the membranes that surrounds and protects the nerves of your spinal cord.

Arachnoiditis causes severe stinging, “burning” pain and neurological problems. It most commonly affects the nerves of your lumbar (low back) and thoracic spine (middle back). It rarely affects your entire spine.

The course of this condition remains highly variable since arachnoiditis can be either a static (stays the same) or progressive (gets worse over time) disease