Sensory Sensitivity: When the World Feels Too Loud

For most people, a busy shopping centre is mildly tiring. For someone with heightened sensory sensitivity, it can be genuinely overwhelming, the overlapping sounds, the fluorescent lighting, the press of bodies, the smell of food courts, registering not as background noise but as an assault requiring active effort to manage.

Sensory processing differences affect a significant portion of the population. They are most commonly discussed in the context of autism, but occur across a range of conditions including ADHD, anxiety disorders, PTSD, and highly sensitive personality (HSP), and in many people with no formal diagnosis at all.

What Is Sensory Processing?

Sensory processing refers to the way the nervous system receives, organises, and responds to sensory information from the environment and the body. It covers all seven senses: the five familiar ones (sight, sound, smell, taste, touch) plus proprioception (awareness of the body's position in space) and interoception (awareness of internal body states like hunger, temperature, and heart rate).

For most people, sensory processing happens largely automatically, the brain filters out irrelevant stimuli and brings relevant ones into focus. For people with sensory processing differences, this filtering system works differently. Stimuli that others barely register can be experienced with full force.

Hyper- and Hypo-Sensitivity

Sensory differences don't always present as over-sensitivity. There are two directions:

Hypersensitivity (over-responsivity):

  • Discomfort from clothing textures, labels, or seams
  • Pain from sounds that others find normal (known as hyperacusis)
  • Aversion to certain food textures or smells
  • Distress in brightly lit or visually busy environments
  • Feeling touched as painful rather than pleasant

Hyposensitivity (under-responsivity):

  • Seeking intense sensory input, loud music, spicy food, deep pressure
  • Reduced awareness of pain or temperature
  • Bumping into things, misjudging personal space
  • A constant need for movement or physical stimulation

Many people experience a mix of both, varying across different sensory channels.

What Happens During Sensory Overload

Sensory overload occurs when the volume of incoming sensory information exceeds the nervous system's ability to process it. The experience varies by person but commonly involves:

  • An escalating sense of agitation or panic
  • Difficulty thinking clearly or speaking coherently
  • A strong, often irresistible urge to escape the environment
  • Physical symptoms: headache, nausea, muscle tension, heart racing
  • Emotional dysregulation: sudden tears, anger, or shutdown

In autistic individuals, overload can trigger what is known as a meltdown (an involuntary loss of behavioural control) or a shutdown (withdrawal and reduced responsiveness). Neither is a tantrum or a deliberate choice. Both are the nervous system hitting its limit.

Sensory Sensitivity in Autism and ADHD

Research suggests that up to 90% of autistic individuals experience some form of sensory processing difference. For many, sensory challenges are among the most functionally impairing aspects of daily life, more so than the social communication differences that typically define the public understanding of autism.

In ADHD, sensory sensitivity is also common, though less consistently recognised. Hyperreactivity to sensory input can compound attentional difficulties: when the environment is physically overwhelming, concentration becomes nearly impossible.

Practical Strategies for Managing Sensory Sensitivity

There is no cure for sensory processing differences, but there are many effective strategies:

Environmental adjustments:

  • Choosing seating away from speakers, air vents, or high-traffic areas
  • Using lamps rather than overhead fluorescent lighting
  • Wearing noise-cancelling headphones in loud environments
  • Selecting clothing made from tolerated fabrics

Pre-loading and recovery:

  • Spending time in low-stimulation environments before demanding events
  • Building explicit recovery time after sensory-heavy experiences
  • Identifying a safe retreat space at home and, where possible, at work

Tools and accommodations:

  • Ear defenders or filtered earplugs (musician's earplugs reduce volume without distorting sound)
  • Sunglasses indoors when light sensitivity is significant
  • Weighted blankets for proprioceptive comfort
  • Fidget tools that provide low-key sensory input without distraction

Occupational therapy: Sensory integration therapy, delivered by an occupational therapist with relevant training, can be particularly effective, especially for children, but also for adults.

The Social Cost of Sensory Sensitivity

One of the least discussed aspects of sensory sensitivity is its social cost. Avoiding restaurants, concerts, parties, and public transport to manage sensory input is rational self-protection, but it can look like antisocial behaviour, anxiety, or rudeness. Many people with sensory differences mask their difficulties in public, then spend the remainder of their energy recovering in private.

Recognition matters. Simply having a name for the experience, and understanding that it is neurological, not personal weakness, can make a significant difference to how people relate to themselves and advocate for what they need.

This article is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment.