Is this boob pain too?

[thunderonlyhappenswhenits]

Today I've been getting the odd twinge/stab under my armpit. Not on my armpit by lower down, so imagine where the side boob is but abit further round. Is there breast tissue here ? It doesn't seem like there is but just wondering if it could be to do with hormones etc ?

Giving a bump

I got that to start with , but I think it was because my boobs were different I just had to get a new bra ... I changed to a sports bra and was fine

Thanks for replying. I've had a google and it seems it's normal as apparently the breast tissue goes into the armpits, it's like my ribcage area.
I have ordered a couple of new bras. I measured myself for the first time and apparently wearing the completely wrong size so will see if they actually fit !