Drinking water is generally not recommended before the morning physical examination. This is because drinking water may affect the accuracy of the results of routine urine and blood tests. Drinking water before the physical exam will increase the body’s fluid intake, which may dilute the blood or have an effect on the urine, which in turn may have an effect on the urine routine results, blood routine results and biochemical electrolyte results. So try not to drink water before the physical examination, but if there are cases where you must drink water, such as taking antihypertensive drugs, you can drink a small amount of water. But if you need to hold urine in the morning, you can drink water to produce a certain amount of urine.