Clinically, mild formaldehyde poisoning can usually recover on its own, without special treatment. Mild formaldehyde poisoning is usually caused by living in a newly renovated house or working in a newly renovated office. Patients may have symptoms of irritation of the eyes and upper respiratory mucosa, such as conjunctival congestion and edema; breath sounds are rough, dry and wet rales, and the chest X-ray examination may show an increase in the lung texture and coarsening. Some patients may also have mild laryngeal edema, and rarely have neurological symptoms. Patients are advised to evacuate formaldehyde-containing rooms in a timely manner, or open windows to maintain indoor air circulation, and the symptoms can be relieved on their own after a period of time. If there is serious discomfort or intolerable symptoms, you can promptly go to the hospital neurology or ophthalmology, given oxygen, to exclude other injuries, can soon be relieved. Formaldehyde pollution exists in many aspects of life, daily life, new furniture should be placed outside to ventilate before use, the newly renovated house should also be vacant for a period of time before living.