The initial reactions of the body in formaldehyde poisoning are mainly reflected in the respiratory system, skin and mucous membranes, and the nervous system, which can be manifested as nasopharyngeal discomfort, photophobia, lacrimation, dizziness, etc. 1. In the respiratory system: patients may feel discomfort in the nasopharynx, accompanied by slight swelling and pain or itching, and will sneeze, cough, runny nose, and some patients will have symptoms of allergic asthma such as chest tightness and shortness of breath; 2. In the skin and mucous membranes. The mucous membranes of the eyes will be irritated with pain, photophobia, lacrimation, and increased eye secretions. The skin will be red and dry after stimulation, and various rashes and dermatitis will appear, with color changes and allergic edema; 3. Nervous system: Patients with damaged nervous system will experience loss of appetite, peripheral weakness, headache, dizziness, and sleep disorders, and some patients will experience autonomic dysfunction such as rapid heartbeat. Formaldehyde poisoning requires precaution, good personal protection, and timely bathing and changing of clothes after exposure. Long-term human exposure to formaldehyde will cause inhibitory effects on the central nervous system, so move into a newly renovated house to determine the concentration of formaldehyde, to open windows and ventilation. For newly purchased textiles and decorative materials, monitor whether the content of formaldehyde meets national standards to prevent poisoning.