According to the authors' data positive thermographic findings have been noted in gastritis and gastric and duodenal ulcer cases, mostly in complicated forms of the disease or in aggravation of the inflammatory process. Malignant neoplasms of the stomach are most often mirrored in the thermograms as zones of increased radiation adequate to the localization and spreading of the focus of the lesion (77%). A stable character of the pathologic thermoasymmetry in malignant neoplasms, as it is found in repeated studies, allows to make a differential diagnosis with inflammatory diseases subsiding with the treatment, which gets confirmed through the decline or vanishing of pathologic thermographic signs found in the repeated studies.