Background:Inflammatory bowel diseases (IBD) are chronic diseases characterized by inflammation of the gastrointestinal tract and approximately half of the patients may present with systemic manifestations, including thrombosis.The objective of this study was to identify the prevalence of thromboembolic events (TEE) in inpatients with IBD and to investigate risk factors for their occurrence. Methods:This was a retrospective single-center longitudinal study from a brazilian IBD referral unit between 2004 and 2014.Patients hospitalized for more than 48 hours, due to active IBD and who did not use prophylaxis for TEE during hospitalization were included.Patients were allocated in two groups: those with TEE up to 30 days or during the hospitalization (TEE-group) and patients without TEE (control-group).Clinical and laboratorial characteristics of the patients were analyzed. Results:53 patients were evaluated, 69,8% with Crohn's disease (CD) and 30,2% with ulcerative colitis (UC).The prevalence of TEE, 30 days before or during hospitalization, was 15.1%, 10.8% in CD and 25% in UC.In the TEE group, median of serum albumin was 2. 05 (1.47-2.62)and 3.40 (2.72-3.90) in the control group.Patients who had albumin levels less than or equal to 2.95g/dL (43.18%) had a higher risk of developing TEE (RR 1.72; 95% CI: 1.17-2.53)(p<0.001). Conclusions:In patients with TEE, albumin levels were significantly lower.Hypoalbuminemia was considered a risk factor for the development of TEE in this population.