You may feel a slight pressure.

When I was a kid our family physician was a retired Army doctor named Doc Scutter who always used these old reusable syringes. The needle always seemed to be about the size of a roofing nail. I used to have nightmares about getting jabbed with these things. Here's a classic glass Italian syringe from days gone by. Olympus OM-4T, Zuiko 90mm F/2 Macro and Ilford HP5 Plus.