When getting immunized, how does the needle go through the skin so easily and painlessly?

Question

This might be just me, this excludes the pain afterwards.

In: Biology

Answer 1

Sharp clean cuts don’t hurt much. Paper cuts hurt because they essentially microscopically saw away the line that they “cut”. A cut from a knife doesn’t hurt nearly as bad (y’know, so long as the knife’s clean) because the damage is only one very thin line. A lot less pain sensors in your skin are activated in a sharp cut. Those needles are very sharp and hardly cause any damage to the skin, and therefore don’t cause much pain.