It’s because of a condition that can exist independently from autism, but frequently coincides with it, which is Sensory Processing Disorder (SPD). Such people can be hypersensitive (more sensitive), or hyposensitive (less sensitive) to things affecting their senses. Those who are _hyper_sensitive to touch are more likely to have an adverse reaction to pain and physical sensations. Much like autism, people aren’t sure what causes SPD.
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