Salt water replenishes electrolytes. Electrolytes in the body include magnesium, calcium, sodium, chlorine and potassium. Generally salt water is salt water with a concentration of about 0.9%, of which the main components are water, sodium and other elements, so salt water can replenish electrolytes. Drinking salt water may aggravate the condition of patients with hypertension, cardiovascular disease and renal dysfunction, leading to an increased risk of cardiovascular damage. It can also lead to sodium storage and cause edema. Fasting is required to do blood electrolyte tests. In patients with electrolyte disorders, avoid spicy and stimulating foods, as well as pickled foods, and eat a light diet. After taking saline, if the patient has uncomfortable symptoms, timely go to the hospital for treatment, so as not to delay the condition. If you use saline to clean the wound, it is recommended that patients go to the hospital to seek medical attention and use it under the guidance of a professional doctor, and it is not recommended to prepare it on your own.