Diabetes mellitus is a condition characterised by elevated blood glucose levels that can lead to significant acute and long-term complications. Alongside these physical complications, the condition can have substantial effects on people’s emotional well-being, potentially resulting in diabetes distress and/or major depressive disorder. Therefore, timely assessment and referral of patients with diabetes who display signs and symptoms of diabetes distress or other mental health conditions are essential. This article discusses emotional well-being in patients with diabetes, and outlines some diabetes-specific validated assessment tools that can be used in practice. It also discusses the management and appropriate onward referral of people with diabetes who require support.