how old are you it all depends on how much your arm developed im 14 and i throw a 4 seam 2 seam and a curve but my arm only hurts after throwing a lot after games just make sure to ice it a lot and make sure to stretch out your throwing arm before throwing and start out with a nice soft toss before getting into anything
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You are overthrowing. Take a couple of days off, ice it, and warm it. Then when you start throwing again slowly build up to speed. Don’t try to throw as hard as you can.
maybe your over using it