INTRODUCTION: In Brazil in 2012, it was estimated 30.140 of new cases of colorectal cancer (CRC) and 8.900 of bladder cancer, which can result in ostomy. This study aimed to evaluate patients diagnosed with CRC, which an intestinal ostomy is formed; and urostomy for bladder cancer, in Ourinhos city, Brazil. METHODOLOGY: Cross-sectional research, which clinical assessment instrument was used to characterize sociodemographic, clinical and therapeutic data in a population of 100.000 inhabitants, with statistical analysis (SPSS 16.0). RESULTS: Identified the age over 61 years (62.9%), male (52.6%), white and retired (63.2%), studied up to 8 years (68.5%), catholics (78.9%) and chronic diseases such as hypertension (52.5%). Clinical and therapeutic data: in patients weighing over 66kg, Body Mass Index above 25 (63.1%), CRC (47.9%), and other diseases (52.1%), initial staging (52.7%) treated with chemotherapy and radiotherapy (26.3%), time of stoma up to 1 year (58%), patients with colostomy (84.2%) and urostomy (10.5%), use of traditional two-pieces system (89.5%), skin barrier flat (84.2%) and frequency of changing up to 3 times a week (94.8%). CONCLUSIONS: Prevalence of disease for oncology resulting in ostomy, which indicates the need for specialized and systematized care during the preoperative period, with emphasis on teaching self-care.