What causes a popping sensation on the left side of my chest and sternum? NO PAIN. Almost feels like when you crack your neck. PCP says heart ok.
Costal cartilage . The most common cause of the popping sensation you describe is separation of the cartilage on the ends of the ribs from the sternum. There are many reasons this can happen but the important fact is that it has no medical significance. occasionally this condition can be accompanied by pain which is best treated with NSAIDs like Ibuprofen. In the absence of pain there is no need to worry. .