甲醛是无色、具有强烈气味的刺激性气体，其35%~40%的水溶液通称 福尔马林。甲醛是原浆毒物，能与蛋白质结合，吸入高浓度甲醛后，会出现呼吸道的严重刺激和水肿、眼刺痛、头痛，也可发生支气管哮喘。皮肤直接接触甲醛，可引起皮炎、色斑、坏死。经常吸入少量甲醛，能引起 慢性中毒，出现粘膜充血、皮肤刺激症、 过敏性皮炎、指甲角化和脆弱、 甲床指端疼痛，孕妇长期吸入可能导致新生婴儿畸形，甚至死亡，男子长期吸入可导致男子精子畸形死亡，性功能下降，严重的可导致白血病，气胸，生殖能力缺失，全身症状有 头痛、 乏力、 胃纳差、 心悸、 失眠、体重减轻以及 植物神经紊乱等。
Formaldehyde is a colorless, strong odor irritant gas, its 35% - 40% aqueous solution is generally known as formalin. Formaldehyde is a kind of original plasma poison, which can combine with protein. After inhalation of high concentration formaldehyde, it will cause serious irritation and edema of respiratory tract, eye tingling, headache, and asthma. Direct contact with formaldehyde can cause dermatitis, macular and necrosis. Frequent inhalation of a small amount of formaldehyde can cause chronic poisoning, mucosal congestion, skin irritation, allergic dermatitis, nail keratosis and fragility Pain in fingertip of nail bed, long-term inhalation of pregnant women may lead to deformity or even death of newborn babies, long-term inhalation of men may lead to deformity and death of men's sperm, sexual function decline, serious can lead to leukemia, pneumothorax, lack of reproductive capacity, systemic symptoms such as headache, fatigue, poor appetite, palpitation, insomnia, weight loss and autonomic nervous disorders