Formaldehyde is an organic chemical substance that is widely used in chemical materials and textile industries. Formaldehyde may cause headaches because it has a strong irritating odor, is easily volatile, and easily comes into contact with the respiratory tract and skin mucous membranes, which in turn leads to headache symptoms. When the concentration of formaldehyde is low, in addition to headache, it can also cause discomfort in the nasal mucosa, manifested as sneezing, runny nose, etc. It can also cause discomfort and pain in the throat and other symptoms. When the concentration is high, there will also be tears, even chest tightness, nausea and other symptoms, and in serious cases, pulmonary edema, anaphylaxis and other conditions, and may even be life-threatening. When headache symptoms appear, you need to get away from the formaldehyde environment as soon as possible and go outside for fresh air. You can also take oral aspirin to relieve the headache when it is severe. Newly renovated houses pay attention to more ventilation and air dispersion, open windows to change the air, you can also buy air filters to reduce the content of formaldehyde. Prevent excessive formaldehyde inhalation, which can cause blood system diseases, such as leukemia and aplastic anemia, affecting your health.