What causes needles (injections, drawing blood) to hurt? It’s a very tiny piece of metal. What is the mechanism to cause so much pain?

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What causes needles (injections, drawing blood) to hurt? It’s a very tiny piece of metal. What is the mechanism to cause so much pain?

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That all kind of depends on nerves, what part of the body it’s going in, skill of the person doing the sticking, and how big of a baby you are.

“so much pain” is very relative. Personally, needles don’t bother me, there’s a minor prick and slight discomfort and it’s done with. If you are feeling excessive pain, it’s most likely due to the anxiety you are feeling about it. You are psyching yourself into it being worse than it really is. Stubbing your toe hurts WAY more than a needle should.

As far as why you feel pain in the first place, pain receptor nerves tell your body when it’s in danger. If you’re getting stabbed by something, anything, you need to know about it because it could threaten your survival. That’s why these responses were evolved. Sure, the stabbing today could be a needle administered by a skilled doctor or nurse in a sterilized, safe manner, but as far as your body evolution is concerned it could also be a venomous snake or bug, a dirty shard of rock or wood, or anything else that could have at one time meant disaster for your ancient relatives. A sharp pain makes you alert to the threat so it can be addressed.