Objective — to investigate fecal incontinence in patients with genital prolapse. Subject and methods. Forty patients with symptoms of pelvic floor muscle failure (pelvic prolapse) were examined. The patients’ mean age was 56.6±9.5 years. One, two, three or more births were observed in 13 (32.5%), 24 (60%) and 3 (7.5%) cases, respectively. Twenty-six (65%) patients complained of incontinence of difficult components of fecal matter. The patients were divided into 2 groups: 1) 29 (72.5%) women who had not been operated on; 2) 11 (27.5%) patients who had undergone different types of hysterectomy. Evaluation of pelvic-floor muscle function involved comprehensive sphincterometry and a study of excitation signal conductivity along the motor fibers of the pudendal nerve with a St. Mark’s electrode. Results. The anal canal pressure was recorded to decrease both at rest (36.8±6.2 mm Hg in Group 1 and 32.5±5.1 mm Hg in Group 2) and during voluntary anal sphincter constriction (107.6±24.2 and 112.3±35.6 mm Hg, respectively). Analysis of the results showed that more than four-fifths of the patients (9 out of 11) with genital prolapse after removal of the uterus had anal incontinence, which coincided with the presence of characteristic clinical complaints, whereas only 58.6% of the patients with the preserved uterus had clinical and instrumental signs of anal sphincter failure. At the same time, subclinical anal sphincter failure was recorded in 41.4% (less than one half) of the patients in Group 1 and in less than one-fifths of those in Group 2. Pudendal neuropathy was detected in 100% of the patients with genital prolapse. Conclusion. In patients with genital prolapse, fecal incontinence occurs in an average of 65% of cases, which coincides with the presence of complaints; however, 35% showed cases of subclinical anal incontinence, which confirms the need for inclusion of sphincterometry in the mandatory list in order to evaluate rectal obturator function when examining patients with genital prolapse.