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BACKGROUND: The results of surgical treatment of rectal fistulas (RF) directly depend on the accuracy of their diagnosis and the detection of a concomitant disease, such as diabetes mellitus (DM). To improve the results of surgical treatment, it is necessary to take into account the mutual influence of RF and DM, which can aggravate each other’s course.AIM: The study of the features of the course of RF against the background of DM and the assessment of their mutually aggravating influence.MATERIALS AND METHODS: 120 patients with RF were studied, which were divided into two groups: the main group (MG) included 60 patients with DM, the control group (CG) also included 60 patients without DM.RESULTS: In both groups, patients with transsphincteric RF dominated: 39 (65.0%) in the MG and 38 (63.3%) in the CG. Recurrent SPC prevailed in patients with DM (30.0% versus 15.0%), which indicates a more complex course of RF against the background of DM. It was found that in 17 (28.3%) patients, the stage of diabetes compensation after the formation of a fistula with a purulent cavity in the pararectal tissue passed into the stage of subcompensation and, due to an unstable decrease in blood sugar levels, it was necessary to replace tableted antidiabetic drugs with injectable insulin, which says about the deterioration of the course of diabetes against the background of chronic purulent inflammation in the pararectal tissue. The results of the study showed the presence of a direct correlation between the course of chronic paraproctitis and the stage of DM (r=0.50552, p