When people talk about autism, the conversation usually centers on communication and social differences. What often gets left out is how much your child’s physical health can be part of the picture: the trouble keeping up on the playground, the stomachaches nobody can explain, the 5 a.m. wake-ups, the meals that feel like a battle. If you’ve been quietly wondering whether these things are “really” part of autism, or just separate problems piling on top of an already hard diagnosis, many are common in autistic children and worth paying attention to.

This guide walks through the physical side of autism — motor skills, sensory processing, sleep, GI issues, feeding, and the neurological conditions that co-occur more often — so you know what’s typical, what’s worth a doctor’s visit, and what you can start doing today. 

What to Do Today 

You don’t need to wait for a full evaluation to start helping. A few places to begin:

• Write down what you’re noticing — specific behaviors, when they happen, how often — before your next pediatrician or therapy appointment. Vague worries are hard to act on; “stops eating after 10 minutes and refuses anything with a new texture” is not. 
• If motor coordination is a struggle, low-cost tools can help immediately: a balance board or therapy ball for core strength and stability, or a weighted lap pad for a child who’s constantly seeking pressure input. 
• If sleep is the hardest part of your day, start with the environment before anything else — a consistent wind-down routine, blackout curtains, and removing screens an hour before bed address a large share of pediatric sleep problems on their own.
• If your child’s behavior suddenly gets harder without an obvious trigger, check for physical discomfort first — constipation, reflux, and unrecognized pain are common, treatable, and easy to miss in a child with limited verbal skills.
• If you notice staring spells, sudden loss of muscle tone, or unusual repetitive movements that are different from your child’s usual stimming, bring it up with your pediatrician promptly. They can decide whether an EEG or another evaluation is appropriate.

Motor Development and Coordination

Motor differences are one of the most common, and most under-recognized, physical effects of autism. A population-based cohort study found that half to nearly all autistic children show some degree of motor impairment on standardized assessments, depending on which skills and tools are measured — yet motor difficulties are rarely flagged as part of a child’s autism diagnosis, because they aren’t part of the diagnostic criteria. 

Gross Motor Skills

Gross motor skills are the large movements involved in walking, running, jumping, and climbing. Your child may have walked later than expected, seem clumsy compared to peers, or avoid playground equipment that requires coordination. These are not signs of laziness or a lack of trying. They can reflect differences in motor planning, coordination, and how the body responds during movement.

Fine Motor Skills

Fine motor skills involve the small, precise movements needed for writing, buttoning clothes, and using utensils. Handwriting is often particularly difficult — your child’s writing may be larger, messier, or slower than classmates’. Occupational therapy alongside ABA can target these skills directly.

Motor Planning (Dyspraxia)

Some children have difficulty with motor planning — the ability to conceive, organize, and carry out an unfamiliar sequence of movements, sometimes called dyspraxia. A child with motor planning difficulties might struggle to learn tasks like tying shoes or riding a bike even with the physical strength to do them; they typically need more repetition and more explicit instruction than peers who pick up new movements just by watching.

Sensory Processing Differences 

Sensory processing differences are common enough in autism that they’re included in the diagnostic criteria, and they have direct physical effects on your child’s day-to-day experience.

Hypersensitivity (Over-Responsiveness)

Children who are hypersensitive react more intensely to sensory input than expected. Physical signs include:

• Covering ears or becoming distressed in noisy environments
• Gagging or vomiting in response to certain food textures
• Complaining that clothing is painful, or refusing certain fabrics
• Squinting or becoming agitated under bright or fluorescent lights
• Strong negative reactions to light touch, like being brushed against in a crowd

Hyposensitivity (Under-Responsiveness)

Some children show a reduced response to sensory input instead. Physical signs include:

• High pain tolerance — not reacting to injuries that would upset other children
• Seeking out intense sensory experiences like spinning, crashing, or deep pressure
• Appearing unaware of temperature changes
• Stuffing their mouth with food without chewing properly

Many children also actively seek sensory input through behaviors like jumping, spinning, hand-flapping, or rocking — sometimes called stimming. These behaviors serve a real regulatory purpose and shouldn’t be discouraged without understanding what they’re doing for your child.

Gastrointestinal Issues

Gastrointestinal problems are significantly more common in autistic children than in the general pediatric population, though estimates vary widely by study — a 2023 systematic review found reported rates ranging from roughly a third to over half of autistic children, most commonly chronic constipation, abdominal pain, and reflux.

• Chronic constipation: the most frequently reported GI problem, which can cause real discomfort and contribute to irritability, aggression, or self-injurious behavior.
• Abdominal pain: a child with limited verbal skills may not be able to tell you their stomach hurts. Watch for pressing on the abdomen, refusing to eat, or a sudden increase in behavioral problems.
• Gastroesophageal reflux (GERD): more common in autistic children, and can cause pain, food refusal, and sleep disruption.

GI problems and behavior are closely linked. Physical discomfort can sometimes show up as changes in behavior, especially when a child has difficulty identifying or communicating pain. If your child’s behavior suddenly worsens without an obvious trigger, a GI issue may be the underlying cause — work with your pediatrician or a pediatric gastroenterologist to rule one out.

Sleep Difficulties

Sleep problems are one of the most common co-occurring issues in autism, with published estimates ranging from about 40% to 80% of autistic children affected — not just occasional restless nights, but persistent patterns that affect the whole family.

• Difficulty falling asleep: often taking significantly longer than peers, sometimes over an hour after getting into bed.
• Frequent night waking, with difficulty returning to sleep.
• Early morning waking, sometimes as early as 4 or 5 a.m., with no ability to fall back asleep.

Differences in melatonin production, sensory sensitivities that make it hard to get comfortable, and anxiety all appear to contribute. Poor sleep and difficult daytime behavior tend to reinforce each other — insufficient rest worsens attention and emotional regulation, which then makes the next night’s sleep even harder.

Feeding and Nutrition Challenges

Restricted or selective eating is extremely common in autism. A 2025 meta-analysis found autism and ARFID (Avoidant/Restrictive Food Intake Disorder) co-occur far more often than chance would predict, and broader estimates of food selectivity in autistic children range from roughly half to nearly all, compared with a much smaller share of typically developing children.

Selective eating in autism is usually driven by sensory factors — texture, color, temperature, smell — not stubbornness. Other factors like anxiety, rigidity, oral-motor difficulties, and GI discomfort, can contribute too. Left unaddressed, it can lead to nutritional deficiencies (particularly iron, calcium, zinc, and vitamins D and B12), constipation from a low-fiber diet, and dental issues from a diet heavy in processed foods. A feeding therapist or occupational therapist can help expand your child’s diet gradually and safely.

Epilepsy and Other Neurological Conditions

Autism co-occurs with several neurological conditions at higher rates than in the general population, including epilepsy, migraines, and genetic disorders such as Fragile X syndrome.

Epilepsy is worth understanding specifically, because the commonly repeated “20 to 30 percent” figure overstates the risk for most autistic children. A systematic review of 74 studies found a median epilepsy prevalence of about 12% across all autistic children — but that rate climbs substantially with age, reaching roughly a quarter of autistic adolescents. Risk is also higher for children with a co-occurring intellectual disability.

Seizures can begin at any age but are most common in early childhood and adolescence. Some are obvious convulsions; others are subtle, causing brief staring spells or unusual movements that can be mistaken for typical stimming. If you notice episodes of staring, sudden loss of muscle tone, repetitive movements that are different from your child’s usual stimming, or an unexplained loss of skills, talk to your child’s doctor. They can determine whether an EEG or other neurological evaluation is appropriate.

Posture, Balance, and Daily Living Skills

Maintaining a stable, upright posture can be genuinely effortful for some autistic children, which in turn affects coordination during everyday activities like running, jumping, and climbing — and can extend to more complex skills like riding a bike or catching a ball. Because play and physical education both lean heavily on these skills, a child who struggles with them can end up feeling excluded from activities that are just as much about socializing as they are about exercise.

Supporting Your Child’s Physical Health

Addressing the physical side of autism works best as a team effort. Your child’s team might include a pediatrician, pediatric neurologist, occupational therapist, speech-language pathologist, feeding therapist, and ABA therapist. Ongoing evaluation is important because motor, sensory, and GI needs can change as your child grows.

Early, targeted support can help with challenges that affect everyday life. Occupational therapy in particular can address motor planning, sensory integration, and feeding challenges through techniques like balance and coordination activities, sensory integration therapy, and structured, play-based practice.

At Treetop, we understand that behavior doesn’t exist in a vacuum. When a child is in pain or physical discomfort, their behavior may reflect it. Our BCBAs collaborate with families and other providers so your child’s physical health and related needs can be considered as part of their treatment plan.

Frequently Asked Questions 

Does autism itself cause physical symptoms?

Autism is a neurological condition, but autistic children can also experience physical and medical challenges. GI problems, sleep difficulties, motor coordination challenges, and epilepsy occur at higher rates in autistic children, although they are not caused by autism in a simple, direct way.

Why does my child with autism have so many stomach problems? 

GI problems are more common in autistic children, but there isn’t one single explanation for why they occur. Sensory differences, restricted eating patterns, medications, and differences in gut function may contribute, and a pediatrician or gastroenterologist can evaluate persistent symptoms. 

Can ABA therapy help with physical challenges?

ABA primarily addresses behavior, communication, and daily living skills, but it can support goals affected by physical or sensory challenges. BCBAs can also collaborate with occupational therapists, physical therapists, feeding specialists, and medical providers when those needs affect treatment. 

Should I be concerned about seizures?

If your child has staring spells, sudden falls, unusual repetitive movements that differ from their usual stimming, or an unexplained loss of skills, contact their pediatrician promptly. They can determine whether further evaluation, including an EEG, is appropriate.

References

Licari, M.K., Alvares, G.A., Varcin, K., Evans, K.L., Cleary, D., Reid, S.L., et al. (2020). Prevalence of Motor Difficulties in Autism Spectrum Disorder: Analysis of a Population-Based Cohort. Autism Research, 13(2), 298–306.

Gan, J., et al. (2023). Questionnaire-based analysis of autism spectrum disorders and gastrointestinal symptoms in children and adolescents: a systematic review and meta-analysis. Frontiers in Pediatrics.

Schwichtenberg, A.J., Janis, A., Lindsay, A., Desai, H., Sahu, A., Kellerman, A., Chong, P.L.H., Abel, E.A., & Yatcilla, J.K. (2022). Sleep in Children with Autism Spectrum Disorder: A Narrative Review and Systematic Update. Current Sleep Medicine Reports, 8(4), 51–61.

Sader, M., Weston, A., Buchan, K., Kerr-Gaffney, J., Gillespie-Smith, K., Sharpe, H., & Duffy, F. (2025). The Co-Occurrence of Autism and Avoidant/Restrictive Food Intake Disorder (ARFID): A Prevalence-Based Meta-Analysis. International Journal of Eating Disorders.

Lukmanji, S., Manji, S.A., Kadhim, S., Sauro, K.M., Wirrell, E.C., Kwon, C.S., & Jetté, N. (2019). The co-occurrence of epilepsy and autism: A systematic review. Epilepsy & Behavior, 98(Pt A), 238–248.

Autism Speaks. Medical Conditions Associated with Autism. https://www.autismspeaks.org/medical-conditions-associated-autism

National Autistic Society (UK). Motor Skills — A Guide for Professional Practice. https://www.autism.org.uk/advice-and-guidance/professional-practice/motor-skills-1

Propel Physiotherapy. Physical Symptoms of Autism Spectrum Disorder. https://propelphysiotherapy.com/physiotherapy/physical-symptoms-of-autism-spectrum-disorder/

You Don’t Have to Piece This Together Alone

If you’ve spent the last few months googling symptoms at midnight, trying to figure out whether what you’re seeing is “normal for autism” or something that needs attention — that instinct to look closer is exactly right, and you don’t have to keep doing it by yourself. Treetop’s BCBAs work alongside your child’s medical team, not around them, so the physical side of your child’s experience is part of the plan from day one

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