Mercury poisoning in children is divided into acute mercury poisoning and chronic mercury poisoning, and most of the mercury poisoning in children belongs to acute mercury poisoning. After treatment, there will be no sequelae. 2. Damage to the urinary system, which is more serious to the kidneys and can lead to oliguria, anuria or proteinuria, hematuria, etc., which must be treated actively in order not to leave sequelae. 3. Damage to the nervous system and pulmonary function. After chronic mercury poisoning in children, the main manifestations are weakness of limbs, joint pain, paralysis, etc. Some children with chronic mercury poisoning may show mental retardation, developmental delay, etc.