PurposeThe purpose of this study was to identify the perceptions, barriers, and facilitators of self-management of Type 2 diabetes mellitus (T2DM) to determine the factors to consider when developing and implementing a person-centered intervention in patients with poor glycemic control attending primary care.MethodsThis was a qualitative study conducted in 6 primary care health centers in Catalonia. Patients who had been diagnosed with T2DM and had glycated hemoglobin of 9% or more were included. The sampling method was opportunistic, accounting for gender, age, duration of diabetes, and type of treatment. Forty-three semi-structured interviews were conducted. Thematic content analysis was performed.ResultsThe patients perceived the diagnosis of T2DM as a threat to their health, and the diagnosis generated cognitive and emotional representations of T2DM. The emotions associated with the diagnosis included fear of the future, worry, denial, sadness, and dejection. The patients also wondered if there could have been an error in their test results because they did not present any symptoms. These representations, both cognitive and emotional, can produce specific effects in adaptation processes and require different approach strategies, specifically regarding diet, physical activity, and pharmacological treatment. Finally, specific aspects regarding the acceptability and adaptability of the implementation of a new intervention were expressed.ConclusionPatients with T2DM and very poor glycemic control expressed difficulty achieving a balance between the needs and demands of managing and controlling T2DM because they felt it strongly interfered in their daily lives.