Scientists have long been exploring the connection between autism and the immune system, and in recent years, attention has moved toward the role autoimmune conditions might play. While we don’t have all the answers yet, some patterns are starting to emerge. From genetic overlaps to inflammation during pregnancy, here are some key insights into the potential link between autism and autoimmune disease.
Autoimmune conditions are more common in families of autistic people.
Research has found that people with autism are more likely to have close relatives, especially mothers, who live with autoimmune conditions such as lupus, type 1 diabetes, or rheumatoid arthritis. This has led to increased interest in whether genetic or immune-related patterns might contribute to both conditions.
The presence of autoimmune disorders in families doesn’t prove causation, but it does suggest that immune system irregularities might play a role in how autism develops. It also raises questions about how maternal health may influence brain development in the womb.
Inflammation during pregnancy may affect fetal brain development.
Several studies suggest that maternal inflammation—whether caused by infection, autoimmune conditions, or other factors—can influence fetal brain development. This is especially important during the first and second trimesters, when the brain is forming crucial neural pathways.
Chronic inflammation can disrupt how the brain organises itself, potentially contributing to the traits associated with autism. While not every child born during a maternal immune event will be autistic, the risk does appear to be higher compared to pregnancies without immune complications.
People with autism may show signs of chronic immune activation.
Some studies have found that autistic children and adults show elevated levels of certain immune markers, such as cytokines, in their blood or cerebrospinal fluid. These are signs that the immune system is in a constant state of low-grade activation, even without an infection present.
This kind of immune activity can influence brain signalling, mood regulation, and sensory processing. It adds to the theory that, in some people, autism may not just be about brain wiring, but also about how the immune system interacts with that wiring over time.
Autoantibodies have been found in some autistic people.
Autoantibodies are immune proteins that mistakenly attack the body’s own tissues, and in some cases, researchers have found them in the blood of people with autism. These autoantibodies may target parts of the nervous system, potentially interfering with normal brain function.
That doesn’t mean that all autistic people have autoantibodies, but in a subset, it could be one piece of the puzzle. These findings could help explain certain neurological and behavioural patterns, and may guide future treatments that target the immune system directly.
Girls with autism may show stronger links to autoimmune traits.
Autism is more commonly diagnosed in boys, but when girls are diagnosed, their profiles often look different, including more co-occurring health conditions. Some evidence suggests that autistic girls may have a higher rate of autoimmune-related symptoms than autistic boys do.
This could point to different underlying mechanisms in autistic females, potentially involving stronger immune-related influences. It also suggests that sex-specific research is needed to fully understand how autism and autoimmune traits might intersect.
Gut health may connect the immune system and the brain.
The gut-brain connection is a growing area of research in autism, particularly because the gut is such a major part of the immune system. Many autistic people experience gastrointestinal issues, which may be linked to inflammation or immune dysregulation in the gut.
If the gut lining is compromised, sometimes called “leaky gut,” it may allow immune-reactive particles to enter the bloodstream, triggering systemic inflammation. This can potentially affect the brain, influencing behaviour, mood, and sensory regulation.
Some autoimmune diseases are linked to neurological symptoms.
Autoimmune conditions like lupus, multiple sclerosis, and Hashimoto’s thyroiditis often have neurological or cognitive symptoms alongside their physical ones. Brain fog, mood swings, and sensory sensitivity are all common complaints in autoimmune flares.
The overlap in symptoms raises questions about how much immune activity may be affecting the brain in both autism and autoimmune conditions. While they’re separate diagnoses, there may be shared mechanisms involving inflammation, nerve signalling, or immune response.
Genetics may play a dual role.
Genetic studies have found that some of the same genes involved in regulating immune responses are also active in early brain development. This has led to theories that certain genetic profiles could influence both immune function and the way the brain is wired.
It’s not a simple case of one gene causing both conditions, but rather a web of overlapping genetic tendencies. For some people, a combination of inherited immune sensitivity and neurological traits may contribute to how autism expresses itself.
Autism traits may change during immune system flare-ups.
There are anecdotal reports and some early evidence suggesting that autistic traits can temporarily intensify during times of immune activation, such as during illness, allergies, or autoimmune flares. Sensory issues, emotional regulation, and communication challenges may become more pronounced.
This suggests that the immune system doesn’t just play a role during development, but it may continue to influence behaviour across a person’s lifespan. Understanding this could open up new ways of supporting people with autism during times of immune stress.
Some treatments aimed at the immune system show early promise.
Though still in the early stages, some studies are exploring whether immune-modulating treatments like anti-inflammatory drugs or dietary changes could benefit certain autistic people, particularly those showing signs of chronic immune activation.
These approaches aren’t cures, and they’re definitely not suitable for everyone. But in cases where the immune system seems to be a key player, addressing inflammation or immune dysfunction could offer another layer of support alongside behavioural or educational strategies.
The overlap could be stronger in specific subtypes.
Autism is not a one-size-fits-all condition. Some people are minimally verbal, some are highly verbal. Some have co-occurring intellectual disabilities, while others don’t. Researchers believe the link to autoimmune traits may be more common in certain subgroups rather than universal.
This means that understanding who is most affected by immune system factors could be key. Personalised approaches, rather than generalised ones, are likely to offer the clearest insights into how autism and autoimmune patterns connect in real-life people.
More research is needed, but the link is being taken seriously.
While the link between autism and autoimmune disease isn’t fully understood, it’s gaining more attention in both the autism and medical research communities. The idea that autism could, in some cases, involve immune system irregularities is no longer considered fringe or speculative.
Future studies will need to be large, diverse, and nuanced to fully understand this connection. But the progress already made suggests that for some people, autism and immune function may be more tightly linked than previously thought, offering new possibilities for support and understanding.
