What’s happening when you think there’s a bug crawling on your leg, but nothing’s there?
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Parasthesia(s). Can be triggered by changes in the nervous system or circulation. Neurotransmitters can innervate nerves, anxiety can release hormones that trigger certain nerves.
Anxiety of a bug landing on you inducing phantom bug tickles? Possible. Someone else said wind. If you had a bug land on you, you anticipate more – this anticipatory excitement (anxiety) makes you more “nervous” which essentially means nerve sensitivity is increased.
But yeah, can be many things tripping a nerve impulse.
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