many conditions that are not specific to your left-hand side (like ovarian cyst ruptures) can be felt on that half of your ...

Feeling pain under your left breast can be especially worrying. After all, important organs and structures sit on that side ...

Sharp, aching pain that hits on the left side of your breastbone and gets worse ... and painful while causing flu-like symptoms like fever, chills, and body aches, per Johns Hopkins Medicine.