Chest tightness, shortness of breath and regurgitation, these symptoms actually involve many related departments. If an adult has recurrent chest tightness and shortness of breath after activity with regurgitation, it is recommended to check some of the most urgent cases first, see cardiology first to exclude coronary artery disease, angina pectoris, myocardial infarction, which are more serious and life-threatening diseases, and may require further electrocardiogram, blood sampling for cardiac enzymes, and if necessary, the doctor will recommend coronary CT or even coronary angiography. If the cardiology examination comes down okay in terms of the heart and there are no major problems, you can go further to the gastroenterology department to see if there are problems related to the stomach and esophagus that cause shortness of breath and regurgitation, and biochemical tests may be recommended, and further gastrointestinal endoscopy may be done if necessary.