ct Gastric underfilling is not a disease, it means that the entire gastric lumen is not completely propped up by water or air, and is a nonspecific description of the imaging manifestations. Imaging department in the patient to do the upper abdomen ct examination, often let the patient before the examination to drink 600 to 800 milliliters of plain water, only after the whole gastric lumen is propped up, can observe the gastric mucosa on the small foci, if ct gastric filling underfilling, will affect the observation of the stomach. Gastric lumen propping up can show the gastric lumen, gastric wall size, morphology, edge, outline, etc. It is helpful to find out whether there is thickening of the gastric wall, whether there is ulceration of the mucosa, destruction, and whether there are neoplastic organisms in the stomach, etc. If there is any abnormality, the patient will be advised to further perform gastroscopy. Patients with poor ct gastric filling should go to the hospital for timely examination and standardized treatment under the guidance of doctors.