Why is the instinct to immediately suck on a small wound or cut, like if you smash your finger?

Question

What does this do and why do humans seem to instinctively do it?

In: Biology

Answer 1

I think it depends on the person and their age. It could stem from the sucking reflex babies have that makes them feel more comfortable, so sucking on a small cut could alleviate some of the pain. It should generally go away after a certain age.