In an analysis of findings of thermographic examinations of the anterior abdominal wall in 167 patients with gastric cancer four types of thermograms were established: the 1st type of thermographic picture with focal hyperthermia in the epigastric area and left hypochondrium was characteristic of gastric tumors not exceeding the limits of the organ. Carcinomatosis of the abdomen is characterized by the 2nd type of the thermographic picture. The third and fourth types characterized by intensive infrared radiation along all the anterior abdominal wall indicate mostly inoperable tumoral process. Thus, thermography should be recommended for diagnosis of gastric cancer in combination with other methods of examination.