Sensory processing disorder (SPD) is a term for ongoing difficulty taking in, organizing, and responding to information from the senses, such as sound, touch, light, taste, smell, and movement. A child with SPD may be overwhelmed by input that others barely notice, may seem not to notice input at all, or may constantly seek out strong sensations. SPD is not a separate diagnosis in the DSM-5, but sensory differences are real and can affect behavior, attention, and learning at home and at school.
What is sensory processing disorder?
Sensory processing is how the brain and nervous system receive messages from the senses and turn them into useful responses. Most people do this without thinking. When the process does not work smoothly, everyday experiences, such as the feel of socks, the noise of a cafeteria, or the movement of a swing, can feel far too intense or barely register.
The idea goes back to occupational therapist A. Jean Ayres, who described "sensory integration dysfunction" in the 1960s and 1970s. Later, occupational therapists and researchers began using the term sensory processing disorder. Some describe several subtypes, including problems with sensory modulation (over-responsivity, under-responsivity, and sensory craving), sensory-based motor problems, and trouble telling sensations apart.
More than five senses
In addition to sight, hearing, touch, taste, and smell, sensory processing includes:
- Vestibular sense – balance and movement, based in the inner ear.
- Proprioception – body awareness from muscles and joints, such as knowing how hard to press a pencil.
- Interoception – awareness of inner body signals, such as hunger, thirst, or needing the bathroom.
SPD and autism: is SPD an official diagnosis?
SPD is not listed as its own diagnosis in the DSM-5, the manual used to diagnose mental and developmental conditions in the US. However, sensory differences are part of the DSM-5 criteria for autism spectrum disorder, which include being over- or under-reactive to sensory input or having unusual interest in sensory aspects of the environment. Some early childhood diagnostic systems do include sensory processing categories.
The American Academy of Pediatrics (AAP) has advised pediatricians not to use SPD as a stand-alone diagnosis, because it is unclear whether it is a separate disorder or part of other conditions. Sensory issues are common in autism and are also often seen in children with ADHD, anxiety, dyspraxia, and other developmental differences. They can also occur on their own. Researchers continue to debate this question.
Over-responsive, under-responsive, and sensory seeking
Over-responsivity (sensory avoiding)
This is sometimes called hypersensitivity. The child reacts more strongly than expected to sensory input and can quickly reach sensory overload. They may cover their ears at ordinary sounds, refuse certain clothing textures or tags, gag on some food textures, dislike messy play, or become upset in busy, bright places. They often try to avoid or escape the sensation.
Under-responsivity
This is sometimes called hyposensitivity. The child reacts less than expected to sensory stimuli. They may not notice their name being called, not seem to feel minor injuries or temperature, seem tired or "tuned out," or not notice a messy face or hands.
Sensory seeking vs. sensory avoiding
A sensory-seeking child looks for more input: crashing into furniture, spinning, jumping, chewing on shirts or pencils, touching everything, or making noise. A sensory-avoiding child tries to reduce input. Many children show a mix. A child may avoid loud sounds but seek deep pressure and movement. The pattern can change with stress, tiredness, and setting.
Sensory processing disorder symptoms and signs
Signs of sensory issues parents and teachers often notice include:
- Strong reactions to loud noises, bright lights, smells, or crowds.
- Very picky eating based on texture.
- Trouble with dressing, grooming, haircuts, or tooth brushing.
- Clumsiness, poor balance, or trouble with fine and gross motor skills such as handwriting.
- Constant movement or fidgeting, which can look like attention problems.
- Difficulty with transitions and meltdowns after overwhelming days.
These signs matter most when they are frequent, intense, and cause challenges in daily life. Keeping notes on sensory triggers, such as the time, place, and what happened before a hard moment, can help an evaluator. Hearing and vision problems should be ruled out, since they can cause similar signs.
Occupational therapy and sensory integration
An occupational therapist (OT) usually evaluates sensory processing using parent and teacher questionnaires, observation, and standardized tests. OT support may include:
- Sensory integration therapy – play-based activities, often using swings, mats, and other equipment, meant to help the nervous system respond in a more organized way.
- A "sensory diet" – a planned schedule of sensory activities during the day, such as carrying heavy books or taking movement breaks.
- Changes to the environment and teaching the child to notice and manage their own sensory needs.
The evidence is mixed. Some studies, including trials of the structured Ayres Sensory Integration approach with autistic children, have reported progress on individual goals. Other reviews find the research limited, with small studies and inconsistent results, especially for some specific methods such as weighted vests or brushing. The AAP has said sensory-based therapies may be one part of a broader treatment plan, but families should know the research is limited and should agree with the therapist on clear goals and ways to measure whether the therapy is working.
Classroom accommodations for sensory issues
A student does not need an SPD diagnosis to get help at school. Schools look at how sensory issues affect learning. Support may come through classroom strategies, a Section 504 plan, or an IEP under IDEA if the child qualifies in an eligibility category, such as autism or other health impairment. OT can be provided as a related service in an IEP. Common accommodations include:
- Scheduled sensory breaks or movement breaks.
- Noise-reducing headphones during loud or test times.
- A quiet corner or calm-down space.
- Flexible seating, such as a wobble cushion or standing desk, and fidget tools.
- Seating away from doors, windows, or bright lights.
- Advance warning before fire drills, assemblies, and transitions.
- Alternatives for lunch or recess when noise is overwhelming.
Frequently asked questions about sensory processing disorder
Is SPD a form of autism?
No, but the two often overlap. Sensory differences are part of the autism criteria, yet many children with sensory issues are not autistic, and not every autistic child has the same sensory profile.
What are the main types of sensory processing issues?
The most common description includes over-responsivity (avoiding), under-responsivity, and sensory seeking. Some models also include sensory-based motor difficulties and trouble telling sensations apart.
Can you have sensory sensitivity without autism?
Yes. Many children and adults have sensory sensitivities without being autistic. Sensory differences are also common with ADHD, anxiety, and other conditions, and some people have them on their own.
Can a child outgrow sensory issues?
Some children become less bothered as they mature and learn coping strategies. Others continue to have sensory differences as adults and learn to manage their environment.
How to get tested for sensory processing disorder?
Parents can start by talking with their pediatrician, who can check for other causes and refer to an occupational therapist. OTs commonly evaluate how a child processes sensory information. Parents can also ask the school for an evaluation if sensory issues affect learning. Because SPD is not in the DSM-5, doctors and psychologists may instead describe sensory symptoms as part of another diagnosis.
