Congenital insensitivity to pain (Congenital Analgia) is rare and the patient can not feel "physical pain". But their emotional development is normal. Hence, they can understand emotional stimuli and respond to it by crying, laughing, just like normal individuals.
Tickling excites different nerve endings, whereas there are different nerve endings for pain stimulus. They can be tickled. The response has been found to be variable. Some do feel the tickle, whereas other are simply labeled "insensitive and stubborn" when they do not feel any tickle.
Can someone with CIPA flush from embarrassment or sexual arousal? I have heard they don't flush from heat, since their bodies can't regulate their own body temperature... but wasn't sure about flushing or blushing for other reasons.
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