Overview

• An IHME analysis in The Lancet: Diabetes & Endocrinology estimates 44% of people aged 15 and older with diabetes were undiagnosed in 2023 across 204 countries and territories.
• Young adults fare worst on detection, with only about 20% aware of their condition, reflecting fewer routine checks as many guidelines begin screening at age 35.
• The study population was largely type 2 diabetes, and symptoms are often subtle or absent early, which contributes to delayed diagnosis.
• Among those diagnosed, 91% received medication, yet only about 42% of treated patients reached healthy glucose control, leaving roughly 21% of all people with diabetes well-managed.
• Diagnosis rates vary sharply by country income level, with higher-income nations generally identifying more cases, and experts stress early detection to prevent complications such as heart, kidney, nerve, and vision damage.