
Anyone knows why is this happening?
Hi, so recently I've been having my triceps (back of the biceps) Suddenly... Beating. Like a heart.
It's sudden, Sometimes it happens, sometimes it doesn't. It almost always happens only few hours after waking up, More usually when I'm on High school (I'm 13). Idk why, Should I be concerned?
Also, ever since January of this year, when working out, my arms and body shakes. By no reason at all, Even when I'm carrying weights I can easily carry, My body still shakes. It never happened before, and it has been multiple months but I see no change. Could someone explain any of these two for me?