Under normal circumstances, adults can consume 2.5-3.5L of water a day. However, for some adults who are exceptions and suffer from diseases with low basal metabolic rate, such as hypothyroidism and adrenocortical insufficiency, they need to reduce their water intake by 0.5-1.0L on the basis of the above mentioned water intake. If excessive water intake is consumed, water and sodium retention can occur, which can lead to anterior tibial mucinous edema and aggravate the body’s burden. Patients with chronic cardiac insufficiency and renal insufficiency also need to reduce water intake by 0.5L on top of the above mentioned water intake, otherwise swelling of the body will occur, which will also increase the load on the heart and kidneys, thus causing severe chronic cardiac and renal insufficiency to occur.