Indigestion generally does not cause chest tightness. The main symptoms of indigestion include upper abdominal pain, accompanied by belching, acid reflux, heartburn, nausea, vomiting, constipation, or diarrhea, among others. If a patient experiences chest tightness, along with chest pain and difficulty breathing, it is necessary to consider whether it is due to a cardiac disease or a pulmonary disease, and it is recommended to go to the hospital for a formal examination. Initially, it is important to complete an electrocardiogram and a chest radiograph, followed by cardiac auscultation and pulmonary auscultation.