With the improvement of the standard of living, everyone’s health consciousness is also more and more strong, the old saying that “on the medical treatment of the disease, Chinese medicine, medical treatment of the disease, under the medical treatment of the disease has been sick of the disease”. Prevention is better than cure, physical examination has become a must for many people, that for the examination of common gastroscopy, how much do you know? First, when do I need to do gastroscopy? Difficulty in swallowing, retrosternal pain, burning, epigastric pain, discomfort, fullness, loss of appetite and other upper gastrointestinal symptoms of unknown cause; 2, upper gastrointestinal bleeding of unknown cause; 3, barium meal test can not be diagnosed or can not be interpreted upper gastrointestinal tract lesions; 4, need to be followed up and observed lesions such as gastric ulcers, atrophic gastritis, etc.; 5, need to be treated by endoscopy. What preparations are needed for gastroscopy? 1, 8 hours of fasting before the examination; 2, 5-10 minutes before the examination with 2% lidocaine spray pharynx, generally no need for sedation. 3.How do I need to cooperate during the examination? 1, take the left side of the bed, legs bent, head cushion low pillow, so that the neck relaxation, loosen the neckline and belt; 2, try to relax. Precautions after the examination 1, do not cough up sputum after the examination; 2, such as biopsy and electric polyps and other treatments during the examination process, you need to follow the doctor’s instructions after the examination, before eating; if there is no special treatment, the examined person in 2 hours after the examination, you can eat warm and cool fluids or semi-fluids.