Excessive exposure to formaldehyde may lead to laryngitis, bronchitis, conjunctivitis, dermatitis, kidney damage and other diseases, need to consult a doctor in time. Formaldehyde, also known as anthranilic aldehyde, can coagulate proteins and cause strong irritation to skin and mucous membranes after contact. Inhalation of formaldehyde, the eyes and respiratory tract will produce obvious irritation. For the respiratory system, low concentrations of formaldehyde exposure may occur in the larynx, trachea submucosal congestion, edema, causing rhinitis, loss of sense of smell, pharyngolaryngitis and bronchitis; high concentrations or prolonged exposure leads to severe pneumonitis, laryngospasm, vocal folds edema and pulmonary edema, which can develop into respiratory distress and death without timely intervention. In addition, formaldehyde vapor can cause cause eye burning sensation, tearing, conjunctivitis, eyelid edema, keratitis and other ocular symptoms, as well as skin dryness, cracking, keratinization of the palms, dermatitis, erythema, pimples and other skin symptoms. When the above symptoms occur, it is recommended to go to the hospital in time to avoid delaying the condition.