Diabetes increases heart disease risk, particularly blockages in coronary arteries. High blood sugar can damage blood vessels, leading to plaque buildup (atherosclerosis), restricting blood flow and potentially causing heart attacks. Individuals with diabetes often face additional risk factors like high blood pressure and obesity. Symptoms may include chest pain and shortness of breath. Effective management of blood sugar levels, alongside lifestyle changes, is critical to reducing heart blockage risk and improving heart health.