Most rib fractures are treated with rest ... Symptoms often feel like a heart attack—including pain that radiates under the left side of your breast, Dr. Cutler says. Like a heart attack ...
But when you have pain under your ... cartilage that connects a rib to the breastbone, the Mayo Clinic explains. It usually impacts the upper ribs on the left-hand side of your body and can ...
Some other lung-related conditions known to cause chest discomfort include: Pneumonia: This infection inflames the air sacs in your lungs and can make your chest hurt when you breathe or cough.