Formaldehyde is a chemical with strong corrosive, volatile and toxic properties, which can be inhaled by the body through oral and respiratory tracts and lead to acute and chronic poisoning. It can also stimulate the respiratory tract causing throat irritation, sore throat, cough and other symptoms, and the digestive tract can mainly appear nausea, vomiting, regurgitation, heartburn and so on. In addition, headache, dizziness, vertigo and other neurological symptoms can also occur. After oral administration, it can lead to burning of the throat and digestive tract, and can even cause gastric perforation in severe cases. Chronic poisoning mainly occurs in the newly renovated interior and is caused by staying in this environment for a long time. It is recommended that for the first renovation of the house, it must be ventilated for a long time before moving in.