Weird armpit pain when working out...

Sorry for my mild english. Just say so if there's a part the you don't understand.

It only happens when I bench press. The weight isn't too high for me, but I might be doing too many repetitions (30).
It isn't a muscular pain (at least, I think so). It's more like a nerve pain. Sometimes I can take it, but other times, the pain becomes unbearable and I need to stop.

Reason why I think this happens: I think it's because before I start working out, I do a pretty hard push-up program (the 100 Push-Up Training). Combining those 2 programs might be the reason why I feel this pain under my arm.
 
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