Symptoms manifest differently depending on the degree of dehydration. Severe dehydration in the human body can be life-threatening. 1. Mild dehydration: the proportion of water loss to body weight is 3%~5%, the patient’s mental state is slightly worse, the mucous membrane of the lips and tongue is slightly dry, and the amount of urine is slightly reduced, which does not have a great impact on the body. 2. Moderate dehydration: the proportion of water loss to body weight is 5~10%, the patient may be depressed or irritable, the skin temperature is slightly cold, the tongue mucous membrane is dry, the infant’s fontanel and orbital depression, the abdomen is sunken, and the urine volume is obviously reduced, which has a greater impact on the human body, but it is not life-threatening. 3. Severe dehydration: the proportion of water loss to body weight is more than 10%, the patient may appear extremely depressed, seriously ill appearance, rapid and weak pulse, shock, slightly cool skin temperature, dry tongue mucosa, fontanel and orbital depression, navicular abdominal, very little urine or no urine, which can be life-threatening. After dehydration occurs, you should consult the doctor in time and follow the doctor’s instructions to standardize the treatment.