Drinking water in the morning on an empty stomach is beneficial to the body, the body is in a state of physiological dehydration after waking up in the morning, when drinking water can be timely replenishment of the body’s metabolic loss of water. But it is recommended to drink warm water, because compared with cold water, warm water is closer to the body temperature, easy to be absorbed quickly, but also will not stimulate the gastrointestinal tract. But drink water should also master the amount, do not drink more, a cup can be, otherwise there will be a sense of satiety, thus increasing the burden on the gastrointestinal tract, affecting the amount of breakfast intake. If you want to go to the hospital in the morning for laboratory tests, it is best not to drink water at this time, it is too thirsty straw available for a proper sip, which will not affect the results of laboratory tests, but also to solve the sense of thirst.