Excess amounts of sugars or glucose in the blood lead to such a chronic condition called diabetes mellitus. High glucose in blood may cause eye damage, kidney damage, and nerve damage. Diabetes increases the risk of different cardiovascular diseases, such as coronary heart disease, heart attack, heart stroke and narrowing of arteries which diminishes the blood move through the arteries. The abnormal rise of glucose in the blood can harm veins and nerves of the eye, which leads to loss of visions. Likewise, individuals with diabetes have more chances to develop diseases that may cause hypersensitivities. Diabetes is the main cause of cardiovascular diseases, kidney diseases and loss of vision. Diabetes can also cause foot ulcers and hearing problem.