Sensory issues occur when the brain has trouble receiving, organizing, or responding to information from the senses. Instead of filtering and interpreting sensory input smoothly, the brain either amplifies signals that should be manageable, mutes signals that should be noticeable, or fails to coordinate information coming from multiple senses at once. The result can range from mild discomfort in noisy restaurants to severe difficulty functioning in everyday environments.
These challenges affect more than just the five senses most people think of. The body actually processes eight distinct types of sensory information, and problems can show up in any combination of them.
What Happens in the Brain
Under normal conditions, your brain constantly balances two types of signals: excitatory ones that amplify incoming information and inhibitory ones that quiet it down. Sensory issues are linked to a disruption in this balance, specifically too much excitatory activity and not enough inhibitory activity. When that filtering system is off, the brain struggles to decide which signals matter and which ones to ignore.
Two deeper brain structures play key roles. The basal ganglia acts as a gatekeeper, deciding which sensory information gets forwarded to the conscious, thinking parts of the brain. The cerebellum controls how intensely you perceive a sensation. When either system isn’t working properly, sensory signals arrive too loud, too quiet, or out of sync with each other.
Brain imaging studies have also found structural differences. Children with sensory over-responsivity show changes in the white matter tracts that carry sensory signals, particularly in pathways connecting the brainstem to the cortex. These tracts show signs of reduced structural integrity, meaning the wiring that transmits touch, pressure, and body-position information is less efficient than typical.
The Eight Senses Involved
Most people know about vision, hearing, smell, taste, and touch. But sensory issues can also affect three lesser-known systems that are just as important to daily life.
- Vestibular system: Located in the inner ear, this system detects movement and head position relative to gravity. It tells your brain whether you’re upright, tilting, or spinning, and it coordinates your eye movements with your body’s motion. Problems here can cause poor balance, motion sickness, or a constant need to spin and rock.
- Proprioceptive system: Sensors in your muscles and joints tell your brain where your body parts are in space and how much force you’re using. This is what lets you walk up stairs without staring at your feet. When it’s unreliable, you might bump into things, grip objects too hard or too loosely, or appear clumsy.
- Interoceptive system: Internal sensors detect what’s happening inside your body: hunger, thirst, heart rate, the need to use the bathroom, temperature, and pain. Difficulty with interoception can make it hard to recognize when you’re hungry, overheating, or need to rest.
Sensory issues can affect one of these systems in isolation or several at once. Someone might have perfectly typical vision and hearing but struggle significantly with touch and proprioception.
Three Patterns of Sensory Response
Sensory issues don’t look the same in everyone. They generally follow one of three patterns, and a single person can experience different patterns across different senses.
Over-Responsivity
This is the pattern most people picture when they hear “sensory issues.” The brain reacts faster, more intensely, or for longer than the situation calls for. A shirt tag feels like sandpaper. A crowded grocery store becomes overwhelming not because anything dangerous is happening, but because the brain treats every fluorescent flicker, background conversation, and temperature shift as urgent. People with this pattern often avoid situations that trigger overload, covering their ears, refusing certain foods based on texture, or withdrawing from social environments that feel chaotic.
Under-Responsivity
The opposite problem: the brain doesn’t register sensory input strongly enough. Someone with under-responsivity might not notice their name being called, seem unaware of pain after a fall, or appear “zoned out” in environments where others are fully alert. They need more intense input before the signal registers. This pattern is easy to misread as inattention or disinterest.
Sensory Seeking
Sensory seekers actively crave stimulation. They might constantly touch objects and people, chew on non-food items, seek out loud music, love spinning, or crash into furniture on purpose. The key distinction from simple high energy is that the stimulation doesn’t satisfy the craving. It creates a cycle: the person seeks input, gets temporarily organized, then needs more. This can look disruptive, but it’s the nervous system’s attempt to get the input it’s missing.
Who Experiences Sensory Issues
Sensory processing difficulties are extremely common in autism, with an estimated 96% of autistic individuals reporting sensory sensitivities. This is one reason sensory features are now included in the diagnostic criteria for autism spectrum disorder. The overlap with ADHD is also significant: research suggests that 43% of women with ADHD report noticeable sensory sensitivities, compared to 22% of men with ADHD.
But sensory issues aren’t exclusive to these conditions. They also appear alongside anxiety disorders, developmental coordination disorder, and in people with a history of premature birth or early trauma. Some people experience meaningful sensory difficulties without meeting criteria for any other diagnosis.
One important note: sensory processing disorder is not currently recognized as a standalone diagnosis in the DSM-5 or the ICD, the two main diagnostic manuals used worldwide. The American Academy of Pediatrics recommended in 2012 against diagnosing it as a separate condition, partly because there’s no universally accepted diagnostic framework and partly because sensory difficulties often turn out to be a feature of another developmental or behavioral condition. In practice, this means clinicians typically identify sensory issues during evaluations for autism, ADHD, or other conditions rather than coding them on their own.
How Sensory Issues Show Up in Adults
Children get most of the attention when it comes to sensory processing, but adults deal with the same challenges in different contexts. Open-plan offices with constant background noise, bright overhead lighting, and unpredictable interruptions can be genuinely debilitating for someone with sensory over-responsivity. Social gatherings where multiple conversations overlap, perfumes mix, and physical space is tight can trigger the same overwhelm.
Adults with under-responsivity may struggle with tasks that require reading subtle body cues, like recognizing fatigue before it becomes exhaustion or noticing hunger until it turns into a headache. Some adults develop elaborate workarounds over years (always sitting near an exit, wearing noise-canceling headphones, choosing specific fabric types) without ever connecting these habits to a sensory processing difference.
Assessment and Identification
Because sensory processing disorder isn’t a standalone diagnosis, identifying sensory issues typically happens through occupational therapy evaluations. Therapists use standardized questionnaires like the Sensory Processing Measure (SPM-2), where parents, teachers, or the individuals themselves answer detailed questions about responses to different types of sensory input across environments. The results map out which senses are affected and which response pattern (over-responsive, under-responsive, or seeking) applies to each one.
This profile matters because it shapes the approach to managing the issues. What helps someone who avoids sensory input is very different from what helps someone who craves it.
Managing Sensory Issues Day to Day
The most widely used approach is a “sensory diet,” which isn’t about food. It’s a structured daily plan of activities designed to give the nervous system the right type and amount of input throughout the day. Think of it like scheduling meals for your senses: the goal is to prevent the nervous system from getting too overstimulated or too understimulated.
A typical sensory diet alternates between three categories of activity across the day:
- Alerting activities increase arousal and body awareness. These include jumping on a trampoline, swinging, climbing, chase games, dance parties, or crashing safely into cushions. They’re scheduled when energy and focus need a boost.
- Calming activities bring the nervous system down. Examples include deep breathing, massage, chewing resistive foods like bagels, drinking a thick smoothie through a straw, wrapping in a weighted blanket, dimming the lights, or squeezing into a small cozy space.
- Organizing activities help reach and maintain a regulated, “just right” state. These bridge the gap between high and low arousal and help sustain focus for tasks like schoolwork or conversation.
A well-designed schedule might start the morning with an organizing activity during the wake-up routine, follow it with something alerting and then organizing before lunch, use calming activities during a midday break, and wind down the evening with calming input built into the bedtime routine. The environment matters too: having a quiet, low-light space available for calming down is as important as the activities themselves.
For adults, sensory management looks less like a formal schedule and more like deliberate environmental control. Noise-canceling headphones, fidget tools, textured seating, controlled lighting, and planned breaks from high-stimulation environments all serve the same purpose. The underlying principle is the same: give your nervous system what it needs before it hits a crisis point.