The vague pain below the heart is mainly caused by the following diseases: First, heart diseases, angina pectoris caused by insufficient blood supply to the heart, which manifests as pain below the heart, and requires electrocardiogram, cardiac ultrasound, exercise plate test or coronary CT to make a clear diagnosis. Second, diseases of the digestive system, such as chronic gastritis, the stomach is located below the heart, separated from the heart by the diaphragm, the pain caused by chronic gastritis can cause pain below the heart, chronic gastritis patients will be accompanied by other symptoms, such as belching, burping, bloating, heartburn, acid reflux, indigestion and other symptoms, need to fasting examination of H. pylori, upper gastrointestinal endoscopy, clear diagnosis. Third, diseases of the chest wall as well as the rib cage can also cause pain below the heart, such as endochondritis and interstitial neuritis, which can be clarified by systematic physical examination.