Inclusion Criteria:  Patients over 18 years old Patients diagnosed with UC according to ECCO criteria, in ambulatory follow-up in the IBD unit, stratified in remission and mild or moderate ambulatory management activity, determined by clinical (Simple Clinical Colitis Activity Index: SCCAI), biological (fecal calprotectin: CF), and/or endoscopic (Mayo Index) criteria: Remission: defined as a SCCAI < 2 and/or CF < 150 and/or May 0 index Activity: defined as an SCCAI >2, and/or CF > 150, and/or May Index >= 1 and <3. Patients diagnosed with CD according to ECCO criteria, in ambulatory follow-up in the IBD unit, stratified according to remission and mild or moderate ambulatory management activity, determined by clinical criteria (Harvey-Bradshaw index: HBI), biological criteria (CF) and/or endoscopic criteria (Simple Endoscopic Score-CD: SES-CD):  Remission: HBI < 5, and/or CF < 150, and/or SES CD < 3. Activity: HBI >=6 and <16, and/or CF > 150, and/or SES-CD >=3 (>4 if isolated ileal affectation) and <=15.  Exclusion Criteria:  Patients with a previous history of venous or arterial thromboembolism Patients with recent hospitalization or surgery in the last 3 months. Women who are pregnant, undergoing treatment with oral contraceptives or who have received oral contraceptives in the last 3 months. Patients undergoing anticoagulation and/or active antiaggregation treatment Patients with severe activity criteria Patients with other concomitant conditions that favor thrombosis events