Underneath your lungs, there’s a small area where your stomach and esophagus (your food pipe) meet. Coughing, heavy lifting, or straining during bowel movements can put pressure on this area. If there’s too much pressure, part of your stomach can get pushed into the opening. That’s called a hiatal hernia. Chest pain is a symptom, and so is stomach or esophagus pain, bloating, belching, and a sour taste in back of your throat. Most hernias don’t need treatment, but some people eventually need surgery.