Dyspnea can not be detected by gastroscopy. 1. Dyspnea: common causes are upper respiratory tract infection, laryngeal edema, bronchial foreign bodies, lung tumors, bronchial asthma, etc., which can be examined by bronchoscopy, chest CT and so on. Cardiac dyspnea is commonly caused by heart failure, pulmonary embolism, severe anemia, etc., which can be examined by cardiac ultrasound and blood tests. 2. Gastroscopy: It is mainly used for the diagnosis of esophageal, gastric and duodenal diseases, including gastric polyps, peptic ulcer, reflux esophagitis, esophageal cancer, gastric cancer and so on. If you have difficulty in breathing, you need to go to the hospital in time for relevant examinations to clarify the cause of the disease and carry out symptomatic treatment in time.