A good reason to see the doctor ASAP.
It could be shingles go see a doctor right away
Liver and stomach
Look for the Queen Anne style of clothing. It has a very high waist line, just under the breasts so that they are supported and then drapes down loosely to cover the stomach. If you are familiar with My Fair Lady, it is the style of dress Audrey Hepburn wears to the final ball.
There could be several reasons why your breasts might feel tender on the side and underneath. Tender breasts can be part of premenstrual symptoms and can also be a sign of pregnancy.
Your wierd
Breasts don't contain muscle. You can build the muscle under the breasts.
Under your bra is boobs or breasts
The pancreas is right under the stomach. The pancreas is right under the stomach.
Those may be her breasts. She is probably getting ready to have hamster pups, but not that soon. It takes longer for hamsters to have babies.
There is no known way to enlarge the breasts short of augmentation. You can do crunches and situps to tone the abdominals, but only diet can remove excess fatty tissue from the area. So, you can do crunches and NOT diet, but all you will get is muscles under fat. The breasts could potentially become firmer through chest exercises, but they will NOT become larger.
There could be a few reason on why you have tenderness on the side and under the breasts. I would go to the doctor and have it checked out.
Put deoderant under them.