Both hyperglycemia and hypertension are common clinical diseases, which easily occur in the same patient at the same time, but hyperglycemia and hypertension are two different types of diseases with obvious differences. The main differences are as follows: First, the definitions are different: hyperglycemia refers to the high concentration of glucose in the blood, and hypertension refers to the state of blood pressure exceeding the normal value. Hyperglycemia refers to fasting blood glucose over 6.0mmol/L and 2 hours after meal blood glucose over 7.8mmol/L. Hypertension refers to the state of blood pressure over 140/90mmHg. Third, the symptoms are different. Patients with hyperglycemia may have the symptoms of thirst, polyuria, excessive drinking with wasting, and may also be accompanied by blurred vision, numbness of both lower limbs, pins and needles. Patients with hypertension may have dizziness, headache, nausea and other symptoms. Fourth, the diet and treatment are different. The treatment of hyperglycemia is mainly diabetic diet, and oral hypoglycemic drugs or insulin treatment. Hypertension is mainly treated with a low-salt, low-fat diet and, if necessary, with antihypertensive drugs.