Formaldehyde is very harmful to the human body, so it is important to understand what are the hazards of formaldehyde. First of all, formaldehyde can cause acute poisoning and great damage to the skin. When formaldehyde reaches a certain level, the human body will experience uncomfortable symptoms, such as hoarseness, itchy eyes, throat discomfort, dermatitis, respiratory difficulties, and in severe cases, it can cause pulmonary edema, anaphylactic shock and liver failure. When inhaled in excess, it can lead to death. Formaldehyde can also cause leukemia, the main reason is to make the human body gene mutation, produce human hematopoietic function of the damage, has a very strong carcinogenic effect. So be sure to pay attention, when the concentration of formaldehyde is relatively high, be sure to ventilate the room, or buy air filters, can effectively slow down the harmful effects of formaldehyde.