AbstractObjectiveTo investigate cardiovascular risk among diabetic patients with Sjögren syndrome.MethodsThis study was a nationwide population‐based case‐control study from 1997 to 2013, in which the association between autoimmune diseases and diabetes was investigated. The study population consisted of individuals with newly diagnosed type 2 diabetes with macrovascular or microvascular complications with at least two outpatient visits or one hospitalization as the outcome variables, and the exposure variables included traditional risk factors, medications, and autoimmune diseases. The odds ratio of cardiovascular events among each prevalent autoimmune disease and hydroxychloroquine's effect on cardiovascular risk were analyzed.ResultsThe study included a total of 7026 individuals with diabetes with microvascular and macrovascular complications and the same number of patients in the control group. Sjögren syndrome was significantly higher in the diabetes complication group than in the non‐complication group (0.8% vs 0.5%, P = 0.036). By using multivariate analysis, we found hypertension, hyperlipidemia, and Sjögren syndrome to be three independent risk factors for diabetes vascular complications (odds ratio [OR] 1.96, 95% confidence interval [CI] 1.82‐2.10; OR 1.53, 95% CI 1.42‐1.64; and OR 1.67, 95% CI 1.06‐2.65; respectively, all P < 0.05). Treatment with traditional statins and aspirin might be able to overcome the increased risk of developing cardiovascular events while comparing between diabetes patients with and without Sjögren syndrome.ConclusionSjögren syndrome is an unrecognized independent risk factor for cardiovascular events among diabetes patients, which indicates that patients with diabetes combined with Sjögren syndrome require closer follow up regarding cardiovascular complications in clinical settings. Treatment with hydroxychloroquine might not be enough to lower the cardiovascular risk significantly in diabetes patients with Sjögren syndrome.