Lower bicep soreness

I’m having this aching soreness in my lower biceps when throwing off the mound. It’s weird I never get sore in my shoulder area, only in the area in between my biceps and tricep and I can feel my vein pounding. I am in very good shape so conditioning is not an issue. Do I throw through it or stop? I notice this always happens when I start throwing heavily again after a break from throwing. If I keep throwing will it go away. 19 years old.
6’5". 213lbs

You should have a doctor check that out. My guess is that it couldn’t be too serious if it’s just intermittent, but have it looked at just to be sure. And here’s a tip: you really should do more throwing, a lot more, just playing catch every day. That in itself may help resolve the problem. 8)