Inhalation of or contact with formaldehyde, resulting in poisoning, does not usually cause death, but may cause death if a larger amount of formaldehyde solution is taken by mistake through the mouth. Formaldehyde poisoning can cause multi-system symptoms, with eye and respiratory system damage being the main ones. Formaldehyde poisoning caused by different poisoning pathways has different clinical manifestations. 1. Inhalation poisoning can cause keratitis, upper respiratory tract infection, bronchitis, etc., so that the poisoned person has a burning sensation in the eyes, tearing, sore throat, coughing, etc., and will be accompanied by dizziness, fatigue, in severe cases, laryngeal spasm, laryngeal edema and so on. 2. After taking formaldehyde, the oral cavity, pharynx, esophagus, stomach and other parts of the mouth, will soon appear burning sensation, and there will be oral mucous membrane erosion, bloody vomitus and other manifestations, in severe cases, the esophagus and gastrointestinal mucous membrane erosion, respiratory distress, shock, if the adult accidentally take 30~60ml formaldehyde solution, can cause death. 3. direct skin contact with formaldehyde solution, can cause acute contact dermatitis, urticaria, etc., so that the local erythema, pimples, accompanied by pain, itching, contact with concentrated solution can cause skin coagulative necrosis. Formaldehyde poisoning should immediately seek medical attention and treatment under the guidance of a doctor.