Background: Research suggests that people with intellectual disabilities have a higher risk for cardiovascular disease than the general population. The aim of this study was to identify barriers for the prevention, diagnosis, and treatment of cardiovascular disease for people with intellectual disabilities. Method: We conducted individual interviews with relatives and general practitioners and focus group interviews with staff working at an assisted home facility, a cardiac ward, an obesity clinic and two rehabilitation centres (n = 33) in Norway. Inductive approach and thematic analysis were used to analyse the data. Results: We identified barriers on an individual and a structural level. The underlying reason for these barriers is that health problems, such as cardiovascular disease, are regularly overlooked as the condition of intellectual disability "overshadows" other possible diagnoses. Conclusion: This focus on intellectual disability rather than other explanations leads to shortcomings in the prevention, diagnoses, and treatment of cardiovascular disease in this group.