I'm a 44 year on male, I donate platelets on a regular basis. About a 2 weeks ago I donated and I week later I started have a severe pain on the back of my hand. If feels like a pulling on a vein. It only hurt when I flex my wraist down and to the right.
Pain Scale 1-10
flexing down - 5
flexing right - 7
But I will say that both will increase by two if I try to flex while my arm is straight.