If It Hurts When You Do That, Don't Do It

Sometimes people confuse me.

Here is my Quora Answer to the Question, "My hands feel like the veins are full of blood like when after I swing my arm around really fast. What is this symptom called and what does it mean?"

First of all, this is physics, not medicine. Secondly, why couldn't this person figure it out themself? Last, unless you are a Shen Yun or Blue Man Group performer, what adult swings their arms around like that?

Quora Arm Swinger