Throat cancer can also be seen during gastroscopy, but it is not as detailed and intuitive as special laryngoscopy, and laryngoscopy is less irritating and has a high degree of patient cooperation. Gastroscopy is often associated with nausea and vomiting, and staying in the larynx for too long can make the patient extremely uncomfortable. If you have laryngeal symptoms, especially if you suspect an occupying lesion, you should still register with the ENT department for a specialized laryngoscopy. In addition, gastroscopy has very good effect on esophagus, stomach and duodenum, which can visualize the morphology of lesions and can take pathological biopsies and perform endoscopic treatment under endoscopy, etc. It is widely used clinically and solves many difficulties in the diagnosis of gastric cancer, esophageal cancer and duodenal tumor, etc. Moreover, early detection and early treatment can improve the survival rate of patients.