甲醛的主要危害表现为对皮肤粘膜的刺激作用。甲醛在室内达到一定浓度时，人就有不适感，甲醛浓度过高会引起急性中毒，表现为咽喉烧灼痛、呼吸困难、肺水肿、过敏性紫癜、过敏性皮炎、肝转氨酶升高、黄疸等.
The main harm of formaldehyde is its irritating effect on skin and mucous membrane. When formaldehyde reaches a certain concentration in the room, people will feel uncomfortable. If formaldehyde concentration is too high, it will cause acute poisoning, such as sore throat, dyspnea, pulmonary edema, Henoch Schonlein purpura, allergic dermatitis, elevated liver transaminase, jaundice, etc