Transverse myelitis

Transverse myelitis is inflammation across a segment of the spinal cord that damages myelin and disrupts the signals traveling between the brain and the rest of the body. Current understanding describes it as an immune-mediated process causing spinal cord injury, often linked to a preceding infection or an underlying autoimmune disease, though many cases are idiopathic, meaning no clear trigger is found. Sometimes it stands alone, and sometimes it's the first sign of a broader condition such as multiple sclerosis, NMOSD, or MOGAD, so a diagnosis usually prompts a wider workup.

Research describes the annual incidence of transverse myelitis in the United States at around 4.6 cases per million people, and more recent data suggest both the incidence and the tendency for it to affect women more than men may be higher than earlier estimates recognized.

Common signs

Fairly rapid onset of weakness or paralysis, numbness or altered sensation, often a band-like tightness around the trunk, back or neck pain, and bladder or bowel problems, usually affecting the body below the inflamed level.

This is a plain-language summary for orientation, not a diagnosis. Mechanisms are described as current understanding, not settled fact. Work with your own clinician for your care.