A bad stomach can cause coughing and chest tightness. In addition to respiratory diseases, some people have coughs caused by stomach diseases, such as reflux esophagitis, in which the food in the patient’s stomach will reflux into the esophagus through the cardia, as the food in the stomach contains a lot of digestive juices, which are corrosive. Therefore, when food reflux occurs, it can damage the mucous membrane of the esophagus, and in some cases, it can even invade the mucous membrane of the throat, causing coughing symptoms. In addition to coughing, the mucosa of the esophagus can also cause discomfort in the chest area and chest tightness due to the burning pain caused by stomach acid. Some people have a bad stomach due to the presence of esophageal hiatus hernia. When the hiatus hernia increases in size, it can cause compression of the heart, lungs and diaphragm, causing palpitations, shortness of breath, chest tightness and other symptoms, and many people have a cough at the same time.