For a long time, the clinical world treated the brain and the body as if they were separated by a thick concrete wall. We now know that for neurodivergent individuals, especially those diagnosed with autism and ADHD, this wall simply doesn’t exist. Research increasingly shows that autism and ADHD are not just “mental” or “behavioral” traits; they are often part of a multisystemic experience involving the nervous system, immune health, and even the body’s physical scaffolding. Understanding why these connections exist is the first step in moving toward truly integrated, trauma-informed care.
This is why so many neurodivergent individuals experience chronic health conditions. Research shows that neurodivergent people are more likely to have comorbid conditions affecting multiple systems, including the nervous system, connective tissue, immune system, and digestive tract.
Understanding these connections will hopefully help neurodivergent individuals recognize their symptoms earlier, seek accurate diagnoses, and advocate for better healthcare.
Below are five chronic health conditions most commonly associated with autism, ADHD, or both (sometimes called AuDHD).
1. Dysautonomia and POTS
At the heart of many neurodivergent experiences is a highly sensitive and often dysregulated autonomic nervous system (ANS). This is the system responsible for our “rest and digest” and “fight or flight” responses.
Dysautonomia affects the ANS, which controls automatic body functions such as heart rate, blood pressure, digestion, and temperature regulation. A common form of dysautonomia is Postural Orthostatic Tachycardia Syndrome (POTS), where standing up triggers a rapid heart rate and symptoms like dizziness or fainting, chronic fatigue, brain fog, and nausea or digestive problems.
When the ANS struggles to regulate basic functions like heart rate and blood pressure, the brain receives constant “danger” signals from the body. This “bottom-up” dysregulation can mirror or exacerbate symptoms of anxiety and sensory overload, making it clear that what we often call “emotional” dysregulation is frequently rooted in a physiological struggle for internal balance.
Because dysautonomia and POTS symptoms can resemble anxiety or panic, it’s often misdiagnosed or overlooked in neurodivergent individuals. Research is increasingly exploring the POTS-autism connection, particularly regarding nervous system dysregulation.
2. Ehlers-Danlos Syndrome (EDS) and Joint Hypermobility
We are also discovering that the genetic blueprints for neurological development and connective tissue are often intertwined. Many neurodivergent people also live with Ehlers-Danlos Syndrome (EDS) or generalized joint hypermobility. This isn’t just about being “double-jointed”; it’s about the “connectivome”, the literal scaffolding of the body. When connective tissue is more “stretchy” than average, it can affect how nerves send signals and how blood vessels maintain tension. This common genetic thread suggests that the same biological variations that shape a neurodivergent brain may also be responsible for the structural differences that lead to chronic pain and physical instability.
3. Mast Cell Activation Syndrome (MCAS)
The connection extends into our internal defense systems as well. Neurodivergent individuals frequently report higher rates of immune-mediated conditions, most notably Mast Cell Activation Syndrome (MCAS). In these cases, the body’s “guard cells” (mast cells) become hyper-reactive, releasing a flood of inflammatory chemicals in response to minor triggers like stress, certain foods, or environmental changes. This systemic inflammation can cause “brain fog,” fatigue, and heightened sensory sensitivity, creating a cycle where the immune system and the nervous system keep each other in a state of high alarm. MCAS often appears alongside EDS and dysautonomia, forming a “chronic illness triad” commonly reported in neurodivergent populations.
4. Gastrointestinal Disorders in Autism and ADHD
Finally, we cannot ignore the “second brain” in the gut. Up to 80% of autistic children and adults experience significant gastrointestinal issues, ranging from chronic constipation to IBS. The gut-brain axis is a bi-directional communication highway; the health of the microbiome directly influences neurotransmitter production and emotional regulation. When the digestive tract is in distress, it sends distress signals straight to the brain, often manifesting as irritability, executive dysfunction, or “meltdowns.” By addressing digestive health, we also support the neurological well-being of the entire person.
5. Migraines and Chronic Pain
Research indicates a significant overlap between neurodivergence and conditions like chronic primary pain and migraines, rooted largely in how a neurodivergent brain processes sensory input. Because the neurodivergent nervous system often lacks the typical “filters” to dampen incoming stimuli, it can enter a state of central sensitization. In this state, the central nervous system becomes hyper-reactive, effectively “turning up the volume” on pain signals. What might be a minor ache for a neurotypical person can be registered as significant distress by a brain that is already navigating a constant barrage of sensory information.
Migraines, in particular, are frequently more than “just a headache” for neurodivergent people; they are complex, full-body neurological events. There is a profound link between the sensory processing differences in autism or ADHD and the triggers that lead to migraine attacks. When the brain is already working overtime to navigate flickering lights, background noise, or social demands, the neurological threshold for a migraine drops significantly. Furthermore, because of the shared link with dysautonomia, many neurodivergent people experience migraines that are tied to vascular instability. This means that a “flare-up” may be a sign that the entire system is overextended and in need of profound sensory rest.
When Neurodivergent People Should Seek Medical Evaluation
If you experience persistent symptoms described in any of the conditions above, please consult a healthcare provider familiar with neurodivergent chronic illness for evaluation and management.
Frequently Asked Questions (FAQ)
What chronic illnesses are common in autism?
Common conditions include dysautonomia, POTS, EDS, MCAS, gastrointestinal disorders, and migraines.
Are ADHD and chronic illness linked?
Yes, ADHD is associated with higher rates of chronic fatigue, migraines, digestive issues, and dysautonomia.
What are the types of EDS?
There are 13 types, including Hypermobile (hEDS), Classical (cEDS), Vascular (vEDS), Kyphoscoliotic (kEDS), Arthrochalasia (aEDS), Dermatosparaxis (dEDS), and several rare forms.
How does EDS affect neurodivergent people?
EDS can contribute to joint pain, chronic fatigue, digestive issues, and comorbid conditions like POTS and MCAS.
Therapeutic Support That Understands the Intersection of Neurodivergence and Chronic Illness
Many neurodivergent individuals experience chronic health conditions affecting multiple systems. As neurodivergent-affirming psychologists who specializes in adult autism and ADHD, we are aware of these comorbidities (e.g., POTS, EDS, MCAS, digestive disorders, and migraines) and can support you in living a fulfilled life. Contact us or book a free 20 minute consultation call with Dr. Barajas, Dr. Goldman, or Dr. Han to see how we can help.
Have chronic illness and suspect you might be autistic or an ADHD-er? Email Dr. Lee to set up an autism and/or ADHD assessment to gain diagnostic clarity.
