Formaldehyde is too high in the room, if often live in such a room will increase the risk of nasal cancer, but not necessarily cancer. Formaldehyde is a carcinogen, long-term large-scale inhalation of high concentration of formaldehyde air will increase the incidence of nasal cancer, can cause respiratory disorders, visual impairment, skin allergies, intestinal damage, gene mutation, etc., just renovated the house if the formaldehyde exceeds the standard, it is recommended to appropriate ventilation, to be qualified before moving in the indicator. If long time in the room too high formaldehyde air in the middle of life appeared nasal congestion, headache, eye swelling and other symptoms, we should consult a doctor in time, early detection, early diagnosis, early treatment, so as not to affect the health, resulting in serious consequences.