Why are humans so afraid of needles?

Yesterday, I was at the doctor & she wanted to take a blood sample from me. I have no problem with having an injection, but before it happens, my heart races really fast, my blood rushes & flushes through my body, I breathe more heavily, feel nervous & all of my senses are greatly heightened (eyesight, hearing, alertness, etc). However, like I said, it's no problem for me getting an injection as I'm not afraid of a needle, but still seem to feel the nervousness nonetheless.

I'm very curious to know if a human's fear of injections is somehow linked to our ancient past as we were evolving into who and what we are today. For example, I've learned that humans are ticklish because it's an old survival instinct we depended on to warn us when things like insects, snakes, etc were crawling on us & could pose to be a threat.

Do you think it's the same with needles & injections? Do you suppose they are somehow linked to an old, painful device, like a torture device or something?

Answer:
Probably. In old days without simple hygiene and medicine one could die from small wounds that get badly infected. Any break in your skin was bad news. Before discovery of antibacterial agents. It's one of those fears that seem to be hard wired to our brain, like fear of height or other things. I think it's just linked to survival. But not to something man made. It probably take much longer to develop fears hard wired into our brains.
stick one in your eye and see why people are scared of them
Personally to me they hurt!
Very rarely do you get someone who can draw blood or give an injection without it hurting. Even if it doesn't hurt it can be very uncomfortable.
I think its just more of us knowing that something is going to pearce our skin and our brain telling us that is bad. Our skin is there to help keep germs and such out of our bloodstream. That and they tend to hurt
I went to the dentist 2 months ago to get some minor cavities fixed, and the dude stuck 4 HUGE needles in my mouth without even telling me.

Interestingly enough, I didn't even flinch! Guess some people are easier with needles than others, but psychology definately plays a big role here.

If you can feel the needle touching your bone when the doc sticks it in you then it could be a little worrisome.

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