The precautions for gastroenteroscopy include suspending recent medication, clarifying the contraindications related to gastroenteroscopy, and taking a light diet, avoiding foods such as red dragon fruit and tomatoes. 1. Suspend recent medication: usually, gastroenteroscopy needs to take a biopsy for observation, aspirin, clopidogrel and other drugs may have an impact on the data, so should be used one week before the examination to stop treatment. 2. Clear contraindications: the contraindications of gastrointestinal microscopy include patients with complete intestinal obstruction, mental abnormality or other serious illnesses of the body, which should be informed to the doctor before the examination to determine whether the examination is suitable. 3. Dietary attention: before gastrointestinal microscopy should be based on a light diet, avoiding the intake of red dragon fruit, tomatoes and other foods, so as not to cause difficulty in identifying whether it is the gastrointestinal tract in the examination session of active bleeding.