he's been throwing once or more a week (travel practices, & high school voluntary stuff) for the last 4 months, also played fall ball. As of the last month, workouts have been harder and more throwing. Just not much pitching. Now, as of the last few weeks, more hardcore pitching has started...and that's when soreness started (bicep/tricep), and then today (tryouts started today) more soreness but down further toward elbow. Iced it down. Later this evening I felt his arm around elbow ligaments/tendons pushing with slight pressure and no pain felt. Appears to be soreness and he was throwing through it today (good or bad?) He mentioned that other kids are complaining of sore arms as well.
By the way, thanks for the responses so far!