Arsenic has metallic properties and is extremely low in toxicity, but its compounds such as oxides, salts and organic compounds are toxic. Its pure product looks like salt, sugar, gypsum, etc. The compounds that cause arsenic poisoning mainly include arsenic trioxide (commonly known as arsenic), arsenic pentoxide, arsenic hydrogen, arsenic disulfide (realgar), arsenic trisulfide (orpiment), etc. The toxicity of trivalent arsenic compounds is stronger than that of pentavalent arsenic. In my country, most arsenic poisoning is caused by excessive arsenic content in drinking water. Arsenic poisoning in children is generally caused by taking excessive doses of arsenic-containing drugs, and can also be caused by accidentally ingesting arsenic-containing rat poison and insecticides. Poisoning of the mother can lead to poisoning of the fetus and infant.