The common term for the condition where blood sugar levels are abnormally high is hyperglycemia. This condition often occurs in individuals with diabetes and can lead to severe complications if left untreated, such as cardiovascular disease, nerve damage, and kidney failure. Symptoms of hyperglycemia may include frequent urination, increased thirst, and fatigue. Managing blood sugar levels through diet, exercise, and medication is crucial for individuals with diabetes to prevent the harmful effects of hyperglycemia.