Blood sugar, also known as blood glucose, refers to the concentration of glucose (sugar) present in the bloodstream. Glucose is the body's primary source of energy and comes from the food we consume. The body's ability to regulate blood sugar levels is crucial for overall health. High blood sugar levels (hyperglycemia) can occur in conditions like diabetes and may lead to various complications over time. On the other hand, low blood sugar levels (hypoglycemia) can cause symptoms like dizziness and confusion. Monitoring blood sugar levels, especially for individuals with diabetes, is important for maintaining stable health through proper diet, medication, and lifestyle management.