Sudden Pain Under Arms

[Aman]

I sometimes have a sharp pain under my arm - it feels like someone pokes me with a long sharp needle inside of my arm just above my right armpit. when I touch the area, there's no pain at all. It doesn't happen all the time but it can happen at any time and sometimes there can be a couple of times within a few minutes. Since I don't feel any pain after it happens when I touch it, it doesn't seem like I need a physical check. I was wondering if anyone else experiences this same problem, if it's just stress, or if it's serious and I should get it checked out?