Jun 04, · Gastritis can cause abdominal discomfort and pain just under your left breast. Inflammation and irritation of your stomach lining can be caused by Helicobacter pylori bacteria or infections. This can cause you to feel nauseous after eating, have chronic stomach upset, suffer from indigestion, and have a gnawing feeling in your stomach. Jul 30, · While it may be hard to differentiate from a heart attack, costochondritis usually doesn’t include sweating, widespread pain, or breathlessness. Instead, the pain will be: under your left breast.
Feb 14, · Sudden sharp stabbing pain under the left breast usually come from an injury of bones, inflammation of the muscles or ligaments. Pain on the left side when breathing or coughing is usually related to lung problems. Sometimes stomach problems such as gas, heartburn can also lead to sharp pain below the left breast when you have a eat.