Oliver Bee RMTRegistered Massage Therapist

Massage therapy · Kitchener–WaterlooSpinal Arachnoiditis

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What It Is

Spinal arachnoiditis is a pain disorder caused by inflammation of the arachnoid, one of the membranes that surround and protect the nerves of the spinal cord. It is often associated with burning pain, severe stinging and a range of nerve problems (NINDS, 2026).

The term arachnoid comes from the Greek "Arachne", meaning spider, because of the fine, delicate, spiderweb-like membrane it forms.

Inflammation of the arachnoid can lead to scar tissue forming, which can cause the spinal nerves to stick together and stop working properly (NINDS, 2026). Many things can lead to the inflammation, such as chemicals, a direct injury to the spine, infection from viruses or bacteria, complications from spinal surgery or other invasive spinal procedures, and long-term pressure on the spinal nerves (NINDS, 2026).

There isn't a consistent pattern of symptoms, but it often affects the nerves to the lower back and legs. Common symptoms can include (NINDS, 2026):

Muscle spasms, cramps and twitching
Bowel, bladder and sexual problems
Severe pain that can feel like an electric shock
Numbness, tingling or weakness in the legs

Spinal Arachnoiditis Anatomy

The spinal cord is a bundle of nerves running from your brain down your back. Together with the brain it forms the central nervous system, which controls the body's functions. The spinal cord and brain are surrounded by three thin protective membranes, known together as the meninges: the dura mater, the arachnoid mater and the pia mater.

Causes of Arachnoiditis

  1. Spinal surgery, particularly lower back surgery, is one of the most common causes, through scarring and inflammation afterwards (Maillard et al., 2023).
  2. Trauma (injury) to the spine (Maillard et al., 2023).
  3. Epidural steroid injections (Maillard et al., 2023).
  4. Infections, including viral or bacterial infections (NINDS, 2026).
  5. Contrast dye injected into the fluid-filled space around the spinal cord for a type of scan called a myelogram, particularly older oil-based dyes (Maillard et al., 2023).

Arachnoiditis is assessed through a careful case history and is best seen on an MRI scan; a CT myelogram is sometimes used (Maillard et al., 2023).

Not a diagnosis — for more information, contact me or another trusted healthcare provider.

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