Stomach secretory function and gastrin concentration in the blood serum were studied in 45 patients with Sjögren's disease. A sharp decrease in acid- and enzymoforming function of the stomach, disorder of the process of mucus formation and hypergastrinemia were detected in 80% of the patients. The relationship of stomach secretory function, gastrin concentration and the gravity of xerostomia was established. Morphology of the mucosa of the body and antral part of the stomach revealed chronic atrophic gastritis. Massive lymphohistiocytic infiltration of the mucous membrane with focal aggregations of lymphoid elements, atrophy and destruction of the glands were revealed. B-lymphocytes prevailed in the cellular infiltrate. T-lymphocytes were found in a small amount among the infiltrate cells and epithelial cells of the main gastric glands.