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 irritation to skin and mucous membrane. When formaldehyde reaches a certain concentration indoors, people will feel uncomfortable. If formaldehyde concentration is too high, it will cause acute poisoning, such as sore throat, dyspnea, pulmonary edema, allergic purpura, allergic dermatitis, elevated liver transaminase, jaundice, etc
慢性危害
Chronic hazards
甲醛有刺激性气味，低浓度即可嗅到，人对甲醛的嗅觉阈通常是0.06-0.07mg/m3。但有较大的个体差异性，有人可达2.66mg/m3。长期、低浓度接触甲醛会引起头痛、头晕、乏力、感觉障碍、免疫力降低，并可出现瞌睡、记忆力减退或神经衰弱、精神抑郁；慢性中毒对呼吸系统的危害也是巨大的，长期接触甲醛可引发呼吸功能障碍和肝中毒性病变，表现为肝细胞损伤、肝辐射能异常等。
Formaldehyde has a pungent odor, which can be smelled at low concentration. The olfactory threshold of formaldehyde is usually 0.06-0.07mg/m3. However, there is a large individual difference, some people can reach 2.66mg/m3. Long term and low concentration exposure to formaldehyde can cause headache, dizziness, fatigue, sensory disturbance, reduced immunity, drowsiness, memory loss, neurasthenia and mental depression; chronic poisoning also has great harm to respiratory system, and long-term exposure to formaldehyde can cause respiratory dysfunction and liver toxic lesions, manifested as liver cell damage and abnormal liver radiation energy.