Excess lead in a child means that the amount of lead in a child’s body exceeds the maximum limit of lead intake for children. Excessive levels of lead lead can cause problems in several systems, including the following: 1. Nervous system: irritability, hyperactivity, short attention span, aggressive behavior, unresponsiveness, drowsiness, and movement disorders. In severe cases, there is mania and delirium, and high concentrations can cause death. 2, digestive system: abdominal pain, constipation, diarrhea, nausea, vomiting, etc. 3, cardiovascular system: easy to cause cardiac arrhythmia. 4.Urological system: early amino acid urine, diabetes, hyperphosphaturia, and renal failure such as azotemia can be seen in advanced patients. 5, subclinical symptoms: clinical symptoms are not obvious, but easy to appear inattentive, irritable and other symptoms, this time is easy to be ignored by the child’s family, when the symptoms really appear, in fact, irreversible. Treatment: (1) Reduce going out during peak traffic hours; (2) Eat more foods with vitamin C and fiber, such as oranges, kiwis, tomatoes, etc. Through the intake of calcium, iron, zinc, vitamins and dietary fiber, it can stop lead from being absorbed in the digestive tract while supplementing nutrients, which is suitable for the use of blood lead level below 200μg/dl. Dietary fiber is excreted directly through feces without toxic side effects, which is a safer way to excrete lead at present. (3) If the lead content is high, you can take lead excreting drugs to promote the excretion of lead in your body.