Gastroscopy: 1) Gastroscopy can observe the scope of: pharynx, esophagus, cardia, gastric fundus, gastric body, gastric sinus, duodenal bulb, duodenal descending portion and duodenal papilla; 2) This examination can make clear whether we have the following lesions: esophagitis, Barrett’s esophagus (diagnosis needs to be carried out for pathologic examination, and biopsies can be taken when gastroscopy is done), esophageal cancer, cardia, there is no obvious laxity, there are no Esophageal hiatal hernia, gastritis (the severity of gastritis can be clarified, and a biopsy can be taken at the same time to see if there is atrophy, enteritis, cancer, etc., and a biopsy can be taken at the same time to check if there is Helicobacter pylori infection), gastric ulcers, bile reflux, duodenal ulcers, and other pathologies. 3) Therefore, it is recommended to do this examination. There are conventional gastroscopy and painless gastroscopy (anesthesia is given intravenously). (4) The morning of the gastroscopy should be fasting (patients with dysphagia need to fast for a longer time), and before the gastroscopy should be done to improve the infectious disease (hepatitis B, hepatitis C, syphilis, AIDS) tests, and to do the painless gastroscopy need to carry out electrocardiograms and blood tests of liver function. Upper gastrointestinal imaging (commonly known as: drinking barium meal): this test can observe whether we have a short esophagus, esophagus with or without deformation (dilatation, distortion, etc.), esophagus with or without stenosis, and esophageal emptying quickly or slowly, when there is an esophageal hiatal hernia and hernia sac in place can be clarified (sliding esophageal hiatal hernia and small hiatus hernia may not be visible), but also to clarify the presence or absence of gastric ptosis and gastric emptying, but also to clarify the presence or absence of obstruction of upper gastrointestinal tract. It can also clarify the presence of gastric ptosis and gastric emptying, as well as the presence of upper gastrointestinal tract obstruction, diverticula, and other lesions. This examination is of great significance for patients with dysphagia, bloating and vomiting. Fasting is required on the day of the examination (patients with dysphagia should fast for a longer period of time); III. Esophageal high-resolution manometry: This examination can clarify the esophageal dynamics, esophageal dilator muscle pressure, and the presence of esophageal hiatal hernia, etc. It is also useful for patients with dysphagia. It is very important for patients with dysphagia, which can clarify the cause of dysphagia, and it can also be an important reference index for us to decide the operation mode when we perform the surgery; stop taking the drugs to promote gastrointestinal dynamics before the examination; fasting on the day of the examination (patients with dysphagia need to fast for a little longer time). IV. Esophageal acid test (esophageal PH monitoring): This test is mainly to monitor the esophagus with or without gastric acid reflux and the number and severity of reflux, which is very important for patients with acid reflux and heartburn, affected by the medication, the drugs to inhibit gastric acid and gastric mucosa and protectants need to be discontinued before the test for more than 1-2 weeks, and the results of the monitoring vary with the incidence of reflux on the same day (reference index). Fasting is required in the morning of the day of the examination, and you can eat normally after the examination is done; and the laboratory tests for infectious diseases (hepatitis B, hepatitis C, syphilis, AIDS) need to be perfected before. V. Impedance test: This test is a more comprehensive and advanced test for GERD, which is significantly better than esophageal acid test (esophageal PH monitoring) and less affected by oral medication than esophageal acid test (esophageal PH monitoring); it can not only clarify acid reflux, but also monitor alkali reflux, and also clarify the nature of the reflux material (gas reflux, liquid reflux, or gas-liquid mixed reflux); It can clarify the correlation between the occurrence of reflux events and unpleasant symptoms, providing an important reference for the development of a treatment plan. This test is more recommended for patients with acid reflux, heartburn, chest pain and those who have taken oral gastric medications. It is recommended to stop taking gastric medication for more than 1-2 weeks before the test; fasting is required on the morning of the test, and you can eat normally after the test; and you need to complete the laboratory tests for infectious diseases (Hepatitis B, Hepatitis C, Syphilis, and AIDS) before the test. Monitoring results also vary with the occurrence of reflux on the day (reference index). Sixth, throat reflux monitoring: For patients with throat symptoms (cough, laryngeal spasm, pharyngeal foreign body sensation, hoarseness, etc.) is of great significance, when there is acid reflux to the throat, the instrument can monitor it. It is recommended to stop taking gastric medication for more than 1-2 weeks before the test; fasting is required on the morning of the test, and you can eat normally after the test is done; and the laboratory tests for infectious diseases (Hepatitis B, Hepatitis C, Syphilis, and AIDS) need to be completed before. Monitoring results also vary with the occurrence of reflux on that day (reference indicator). Note: 1, each patient’s situation is different; not every patient must complete every test, need to choose according to the condition; test results are affected by a variety of factors, the results can only be a reference, the specific treatment needs to be combined with the patient’s condition. 2, for general reflux patients recommended to improve the first, third and fifth examination; 3, for patients with difficulty in swallowing or vomiting recommended to improve the first, second and third examination; 4. For patients with throat symptoms recommended to improve the first, third and sixth examination.