Children who say they have chest tightness and chest pain may be related to gastrointestinal diseases, heart diseases, pleural diseases and so on. 1. Gastrointestinal diseases: for example, gastroesophageal reflux disease (GERD), due to the reflux of gastroduodenal contents into the esophagus and the oral cavity, resulting in damage to the esophagus, pharynx and other tissues. The result is a dull, burning pain in the chest at the back of the sternum or below the xiphoid process. 2. Heart disease: for example, myocarditis, which may be caused by viruses, bacteria, drugs, etc., resulting in inflammation of the myocardium, and chest tightness or chest pain during the acute attack. 3. Pleural diseases: for example, pleurisy, may be due to viruses, bacteria, tumors and other reasons, resulting in inflammation of the pleura, chest pain, chest tightness, cough and other symptoms. Chest tightness and chest pain can also be seen in other causes, it is recommended to consult a doctor in time, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or therapy.