Transverse myelitis is not a hereditary condition. It does not follow any known inheritance pattern, and having a family member with the condition does not meaningfully increase your risk. The National Institute of Neurological Disorders and Stroke states plainly that transverse myelitis “does not appear to be genetic or to run in families.” It is a rare disorder, affecting roughly 1 to 25 people per million each year, and the vast majority of cases arise from immune system misfires rather than inherited genes.
Why It’s Classified as Sporadic
Idiopathic transverse myelitis, the form with no identified underlying disease, is considered a sporadic condition. That means each case appears independently, without a family clustering pattern. Unlike conditions such as sickle cell disease or cystic fibrosis, there is no gene you can inherit from one or both parents that causes transverse myelitis to develop.
The condition occurs when the immune system mistakenly attacks the myelin coating around nerve fibers in the spinal cord, causing inflammation that disrupts signals between the brain and the rest of the body. This immune attack can be triggered by viral infections, bacterial infections, or other autoimmune processes. In many cases, no specific trigger is ever identified.
A Rare Genetic Variant Worth Knowing About
One notable exception has emerged from research. Scientists studying a Polish family in which two sisters both developed transverse myelitis decades apart identified a rare change in a gene called VPS37A. Both sisters carried two copies of this variant, and when researchers screened 86 additional unrelated patients with transverse myelitis, they found one more person with the same genetic change in both copies.
Based on that screening, the researchers estimated that up to 3% of idiopathic transverse myelitis cases could be linked to this particular variant. That’s a small fraction, and carrying the variant doesn’t guarantee someone will develop the condition. It may simply make the immune system more prone to the kind of spinal cord attack that defines transverse myelitis. The National Institute of Neurological Disorders and Stroke is currently funding further study of this genetic change to determine whether it represents a genuine genetic component.
Even so, this finding doesn’t change the overall picture. Transverse myelitis remains overwhelmingly non-hereditary. The VPS37A variant is exceedingly rare in the general population, and having a family member with transverse myelitis is not a standard reason to pursue genetic testing.
Genetic Susceptibility in Related Conditions
Transverse myelitis sometimes occurs as part of a broader condition rather than on its own. Two of the most common are neuromyelitis optica (NMO) and MOG antibody-associated disease (MOGAD). These related disorders do have a documented genetic susceptibility component, though neither is inherited in a simple parent-to-child pattern.
In NMO, certain immune system genes influence risk. Research in a South Indian population found that people carrying a specific variant of an immune-related gene called HLA-DRB1*10 had roughly 2.6 times the odds of developing NMO compared to those without it. Other gene combinations in the same family of immune genes raised risk even further, with one pairing increasing odds by about 4.5 times. Interestingly, a different variant, HLA-DRB1*14, appeared to be protective, cutting risk by about two-thirds.
MOGAD has its own set of genetic associations. Researchers have identified three gene regions outside the main immune complex that appear to influence susceptibility. These genes are involved in immune signaling and inflammatory responses. Carrying certain variants modestly raises or lowers the likelihood of developing MOGAD, but none of them act as a direct cause.
These genetic links matter because if your transverse myelitis turns out to be part of NMO or MOGAD, there is a layer of genetic susceptibility involved. But “susceptibility” is very different from “hereditary.” These gene variants are common in the general population, and the vast majority of people who carry them never develop any demyelinating disease. They simply tilt the odds slightly.
Conditions That Can Mimic Transverse Myelitis
Some hereditary conditions produce symptoms that look similar to transverse myelitis, which can cause confusion. Hereditary spastic paraplegia (HSP) is one example. It causes progressive leg stiffness and weakness due to degeneration of nerve fibers in the spinal cord, and it genuinely does run in families with well-established inheritance patterns.
The key differences are timing and progression. Transverse myelitis typically comes on over hours to days as a single inflammatory attack, often with a clear lesion visible on an MRI of the spine. It usually stabilizes or improves after treatment. Hereditary spastic paraplegia, by contrast, develops gradually over months or years, progresses steadily, and is not caused by inflammation. If there is any question about whether symptoms reflect transverse myelitis or a hereditary condition, imaging and antibody testing can usually distinguish between them.
What Actually Drives the Risk
Since genetics play little to no role for most people, the real risk factors for transverse myelitis are environmental and immunological. Viral infections are the most commonly identified trigger. Respiratory and gastrointestinal viruses can sometimes provoke the immune system into attacking the spinal cord in the days or weeks following infection. Bacterial infections, particularly those affecting the lungs or urinary tract, have also been linked to cases.
People with existing autoimmune conditions like lupus, Sjögren’s syndrome, or sarcoidosis face a higher baseline risk, because their immune systems are already prone to attacking the body’s own tissues. In these cases, transverse myelitis is a complication of the underlying autoimmune disorder rather than a standalone diagnosis.
For parents wondering whether their children are at increased risk because of a personal history of transverse myelitis: the evidence does not support that concern. The condition is not passed down, and familial cases remain extraordinarily rare in the medical literature.