How can i know difference between costochondritis and a sign of heart attack?

Costochondritis: Costochondritis is inflammation along the breast bone where the cartilage attaches to bone. Does it hurt to press on your sternum? If so, that suggests Costochondritis. Heart attack symptoms often involve a pressure feeling on the chest, nausea, shortness of breath, pain in the haw or the arm. When in doubt, seek medical attention immediately.