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Olfactory Oversensitivity in ASD
Olfactory oversensitivity means the child is highly sensitive to smells — even mild or faint scents may feel overwhelming, unpleasant, or alarming. This happens due to differences in how the brain processes sensory information.
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Common Signs & Behaviours
Children with olfactory oversensitivity may show:
1. Strong reactions to mild smells
• Covers nose or face
• Says “bad smell” even when others don’t notice it
• Moves away from the area immediately
2. Avoidance of certain environments
• Kitchen, bathrooms, supermarkets
• Crowded places with multiple mixed smells (mall, school cafeteria)
3. Food-related difficulties
• Refuses foods with strong aromas (egg, fish, curries)
• Rejects new foods due to smell
• Gags or vomits when certain food is served
4. Difficulty with grooming-toileting
• Strong reaction to perfumes, soaps, lotions
• Avoids brushing teeth due to toothpaste smell
• Avoids toilet due to bathroom odor
5. Emotional reactions
• Anxiety before entering certain places
• Meltdowns triggered by unexpected smells
• Irritability or withdrawal in strong-smell environments
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Possible Causes
• Sensory processing differences in the brain
• Hypersensitivity of the olfactory receptors
• Overactivation of the limbic system (emotional center)
• Previous negative experiences with certain smells
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Management Strategies
1. Gradual Exposure (Desensitization)
• Introduce mild smells slowly
• Start with tolerable scents and gradually increase intensity
• Use scent jars or smell kits
2. Environmental Modifications
• Maintain odor-free spaces
• Avoid strong perfumes at homeschool
• Keep good ventilation in rooms
3. Use Neutral or Familiar Scents
• Use mild, unscented soaps, detergents
• Stick to preferred scented items for consistency
4. Coping Tools
• Provide a scarf, mask, or tissue with a pleasant smell for the child to hold near nose
• Allow breaks in overwhelming environments
5. Feeding Therapy Support
• Start food exposure with similar-smelling items
• Combine familiar aromas with new foods
• Occupational therapy support if gagging persists
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When to Seek Help
• If the child’s daily routines (eating, grooming, school participation) are affected
• If smell triggers meltdowns frequently
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