Nearly 80% of patients with type 2 diabetes also suffer from a cardiovascular illness, the most common of which is Coronary Artery Disease (CAD). It is estimated that diabetes is a contributin factor in approximately 10–15% of patients admitted to hospital with a heart attack (myocardial infarction) and 20% of patients with Coronary Heart Disease (CHD). Diabetic patients have more extensive atherosclerosis, and frequently suffer from silent heart attacks (without chest pain). It is therefore crucial for patients to have an early and accurate diagnosis of both diabetes, and any form of heart disease. This section outlines the best diagnostic techniques and symptoms for diabetic patients to look out for.