Let’s Get Physical: The Physiological Effects of Autism Part 2
How Autism Shows Up in the Body’s Signals, Timing, and Recovery
In Part 1 of Let’s Get Physical, we talked about the physical conditions that are more commonly diagnosed alongside autism — the kinds of issues that eventually get names, acronyms, and treatment plans, even if it takes years to be taken seriously. But, there’s another category of physical experience that often goes unrecognized. Not because it isn’t real, but because it doesn’t fit neatly into a diagnostic box.
These are the bodily traits that don’t always show up on medical tests. The ones that get labeled as anxiety, deconditioning, stress, or “just how you are.” The ones that many late-diagnosed autistic people have been quietly adapting to for most of their lives and may not even realize stray from the norm.
These aren’t necessarily symptoms on a checklist. They’re deeply ingrained nervous system patterns with real physical manifestations.
Interoception differences (or not getting the memo from your body)
Many autistic people experience differences in interoception, or the ability to sense internal bodily signals. This can look like not realizing you are hungry until you are shaky and nauseated, forgetting to drink water all day, or not noticing pain until it becomes overwhelming. Or missing early signs of illness and then suddenly being very, very sick.
It may also look like a hyperawareness of those same bodily signals. Sensations associated with normal processes like digestion become exaggerated, mild discomfort morphs into agonizing pain. With this presentation, every internal twinge can easily become a concern and play into more bodily tension and accelerated awareness. The result? Health anxiety.
Some of use end up with a mixture of hypo-awareness and hyperawareness. For decades I thought I was an anomaly, somehow extremely aware of every single sensation happening inside my body yet also clueless about basic necessities like hydration. How could I identify and wince at the precise moment food waste moved through my digestive system, but easily tolerate levels of pain that made doctors raise their eyebrows? Why was I able to diagnose myself accurately when medical professionals were stumped, but unable to intuitively reposition my body before intense joint stiffness set in from sitting awkwardly for hours?
In reality, my body was sending just signals in a less consistent way than “normal”. I was receiving them sometimes on a delay and sometimes as a rush order. Once I understood this, self-care stopped being a moral issue and became a translation issue. Turns out beating yourself up less opens up more bandwidth for listening to your body with compassion and calmness.
Startle response and constant muscle readiness
Many autistic bodies live in a near-constant state of physical readiness. Whether you tend to default to fight, flight, or freeze mode, your body is ready to react at any moment. You might startle easily and jump, gasp, or shriek at unexpected noises or touches. You may feel your heart race when someone suddenly enters a room. Perhaps you’ve noticed that your shoulders live permanently up near your ears.
This isn’t being dramatic. It’s the result of a nervous system that has learned to stay prepared. Over time, this kind of baseline tension can contribute to chronic muscle pain, jaw clenching, headaches, and a sense that your body never truly powers down. Even rest can feel effortful when your system is still scanning. Understanding this reframes tension not as a failure to relax, but as a body that learned vigilance very early and never got the message that it was safe to stop.
Proprioception and coordination differences
Some autistic people are very aware of their bodies in space. Others are not. Many fluctuate between the two. This can show up as clumsiness, bumping into doorframes, knocking things over, misjudging distance, or struggling with activities that require mirrored movements or fast coordination.
It can also mean feeling completely disconnected from your body until something (like the corner of the coffee table) makes contact and hurts it. These differences are not a lack of intelligence or effort. They are simply another way the nervous system prioritizes information. A brain that excels at pattern, detail, and depth may not always prioritize physical signals or positioning in the same way a neurotypical brain would.
Temperature regulation and body climate issues
Being perpetually too hot or too cold is something many autistic people quietly deal with. You might overheat easily, struggle with sweating patterns, or feel chilled long after others are comfortable. Seasonal transitions can feel physically destabilizing rather than just mildly annoying.
This isn’t just preference or particularity, it’s dysregulation. When the nervous system is already working hard to process sensory input, temperature becomes another variable that easily can tip the body into overload or exhaustion.
Fatigue that doesn’t match your activity level
This is not the fatigue of physically doing too much. It is the fatigue of processing too much. Many autistic adults describe a kind of exhaustion that sleep alone does not resolve. Social interaction, sensory input, decision-making, and emotional regulation all require energy and for autistic nervous systems, that energy expenditure is often much higher.
The result can be intense bouts of physical exhaustion after social events, errands, or even “easy” days. Not because you are weak, but because your system has been working continuously behind the scenes. Rest, in this context, isn’t an indulgence. It is imperative maintenance for your body.
Medication sensitivity and paradoxical reactions
Autistic people often report unusual reactions to medications and needing lower than standard doses. Experiencing side effects quickly is common and so is having medications affect you in the opposite way than what is expected. This can be frustrating and, at times, frightening. It can also lead to being labeled “difficult” or “anxious” in medical settings.
At the end of a recent med check appointment, my doctor told me, “if there are any issues before your follow-up, I know you’ll let me know.” She’s right. I will. Because it isn’t my fault that my body reacts the way it does to medication and I will not advocate less for myself because of it. The reality is that a sensitive nervous system tends to be sensitive across all domains. This is not weakness, a choice, or a character flaw. It is information your body is offering to you and it’s worth taking seriously, whether your doctor gets the memo or not.
Slow recovery after stress, illness, or exertion
One of the most overlooked physical traits of autism is recovery time. Autistic bodies often take longer to return to baseline after stress, illness, travel, or exertion. You might feel “off” for days after something others bounce back from overnight. This can lead to self-blame and pushing yourself too hard. For me, this has endlessly complicated my relationship with physical exercise.
Needing more recovery from illness, injury, surgery, mental stress, or physical exertion does not mean you are fragile or that you shouldn’t bother moving your body. It simply means your system runs deeper than most and needs a little extra time and care to resume functioning optimally.
When tests are normal, but something is still “off”
Perhaps the most common experience of all is being told that everything looks fine. Labs are normal. Imaging is clear. Nothing obvious is wrong. And yet, you are still struggling and know instinctually that something is wrong.
For many autistic people, this is where the disconnect happens. The absence of an explanation does not mean the absence of a problem. It doesn’t mean that you should be quieter and pull back more from your connection to your body. It often means that the tools being used are not designed to measure nervous system differences. This is where curiosity can replace shame and self-advocacy can replace dismissal.
A different way of understanding the autistic body
None of this means that something in you is broken. It means that autistic bodies often communicate differently than their neurotypical counterparts. They signal to the brain differently and they recover differently. They ask for different kinds of care. When we understand this, we can stop forcing our bodies to behave neurotypically and start listening to what they are actually asking for.
Not more “discipline”. Not more “toughness”. More translation without judgement, more accommodation, and more permission to rest. Autism does not live only in the mind. It lives in the rhythms, thresholds, and needs of the body too. And learning that doesn’t have to come as a loss. It can instead be embraced as an invitation to finally stop fighting yourself and get curious about what your body is trying to tell you and what you can do with that information.
Practical Next Steps: Talking to Doctors About Autistic Physical Patterns
If you’ve made and through Part 1 and Part 2 and feel the quiet weight of “this is me,” you might be wondering how to turn that understanding into action—how to communicate with your doctor about things like chronic fatigue, dysautonomia, hormonal disturbances, or unusual medication responses without being dismissed or feeling the need to overexplain and become list in your own words.
This section offers example scripts and guidance you can adapt to your own communication style and your own body. Think of them as scaffolding, not a script to memorize. They’re meant to reduce stress, create clarity, and give your body’s signals a voice.
If you’d like a condensed, portable option download the PDF resource below. It includes quick guidance on effectively describing symptoms and asking for autism-affirming care. And you can bring it along to your appointment with you.
1. Starting the conversation
Sometimes the hardest part is simply naming the pattern. Here are a few ways to open up the conversation:
When you’re looking for an autism-accommodating lens: “I have autism and have noticed some physical patterns that don’t fit typical expectations. I’d like to discuss what accommodations or adjustments might help my unique care plan.”
“I sometimes experience extreme fatigue, temperature sensitivity, or delayed recovery from exertion . I want to make sure my care plan considers these patterns.”
“My body responds very unpredictably to medications. Can we discuss options and adjust the standard dosing that take that into account?”
Tips:
Keep it short and factual.
Center your lived experience, not potential interpretations.
Pause and check: the doctor may need translation, not judgment.
2. Describing interoception or bodily signal differences
Autistic nervous systems can be both hypo- and hyper-aware, and that can make it hard to describe symptoms. Try:
“I sometimes don’t notice pain or hunger until it’s intense. Other times, mild sensations feel amplified. I want to make sure we track symptoms accurately, even if my awareness fluctuates.”
“My body signals differently than average. For example, I might not feel certain injuries or digestive issues until they’re advanced. This affects how I respond to treatment.”
Tips:
Use “I” statements.
Don’t apologize for complexity.
Name what you notice, not what it might mean.
3. Talking about fatigue, recovery, and dysautonomia
Many autistic adults experience fatigue that doesn’t match activity level, slow recovery, or dysautonomia. Examples:
“Even light activity or social interaction can leave me exhausted for hours or days. I sometimes experience dizziness or rapid heartbeat when standing (POTS). I’d like to discuss accommodations and treatment options.”
“I seem to recover more slowly from illness or physical exertion, which affects daily functioning. Are there strategies to support steady recovery and prevent setbacks?”
Tips: Linking patterns to practical outcomes helps doctors take them seriously.
4. Hormonal or reproductive considerations
For AFAB autistic people, patterns like PCOS, endometriosis, adenomyosis, or PMDD can intersect with nervous system differences:
“I experience severe cyclic symptoms, including fatigue, pain, or nausea, which affect my daily functioning. Can we discuss care strategies that account for these patterns?”
“Hormonal treatments I’ve tried have unpredictable effects. I want to make sure we monitor closely and adjust promptly if needed.”
Tips: Connect symptoms to practical outcomes (energy, pain, quality of life) rather than abstract lab results.
5. Closing the conversation or requesting follow-up
“I want to make sure we’re on the same page about my symptoms and patterns. Can we check in regularly to see how things are working?”
“I may need extra time or written instructions for some recommendations. Can we plan for that?”
Tips:
End with collaboration, not argument.
Ask for clarification if recommendations feel unclear.
Remember: your body’s signals are valid and worth attention.
Using these scripts
Adapt them to your tone, comfort, and the appointment context.
Print or copy them if that helps you remember in the moment.
One script per concern is often enough; you don’t need to deliver a speech.
Treat them as translation tools, not prescriptions.
The goal is to give your body’s patterns language and clarity, not to over-explain or convince anyone. With practice, these conversations become easier and less stressful, while also honoring your body’s unique rhythms and needs.