Drowning is when the body is submerged in water, which fills the airways and alveoli, thus causing asphyxia due to impaired ventilation. The main symptom is that the patient may appear unconscious, with pale and bruised skin and mucous membranes, cold extremities, weak breathing and heartbeat, or even respiratory and cardiac arrest. The drowning patient’s nose will be filled with foam or silt and possibly weeds, the abdomen is often bulging due to irrigation, accompanied by dilation of the stomach, and during resuscitation, the drowning patient will exhibit various cardiac arrhythmias and even life-threatening ventricular fibrillation. Some will have heart failure, and generally after 24-48 hours patients will develop cerebral edema, pulmonary edema, and acute respiratory distress syndrome, hemolytic anemia, etc. Other patients have acute renal failure, some have clinical manifestations of disseminated intravascular coagulation, and pulmonary infections are very common in patients who have drowned.