Patients with hyperglycemia accompanied by a lot of sweating will lead to a significant increase in blood viscosity, in this case, it is easy to occur heart attack or brain infarction. After sweating a lot, you should drink a lot of water and drink light salt water to replenish the water deficit in your body, which can significantly reduce the viscosity of blood. If you drink little water on your own, you should go to the hospital to replenish 0.9% saline and insulin intravenously, which will reduce the risk of heart and brain diseases by lowering blood sugar and rehydration treatment.