Hypersensitivity, also called sensory defensiveness, is being overly sensitive to external stimulus. A common hypersensitivity would be touch, when someone becomes irritated or distracted because of tags in clothing. Hypersensitivity can also occur from stimulus from taste, smell, hearing or vision.
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Eileen Bailey is a freelance health writer. She is the author of What Went Right: Reframe Your Thinking for a Happier Now, Idiot’s Guide to Adult ADHD, Idiot’s Guide to Cognitive Behavioral Therapy, Essential Guide to Overcoming Obsessive Love, and Essential Guide to Asperger’s Syndrome. She can be found on Twitter @eileenmbailey and on Facebook at eileenmbailey.