There is a relationship between leukemia and formaldehyde, and long-term exposure to formaldehyde may lead to leukemia, but exposure to formaldehyde is not the same as necessarily getting leukemia. Formaldehyde is only a possible risk factor for leukemia. In addition to formaldehyde, there are other risk factors for leukemia, such as long-term exposure to radiation, long-term exposure to chemicals containing benzene, and infection with specific viruses, long-term hair dye, long-term exposure to hair dye, etc. If a patient is exposed to these risk factors in daily life, it will often lead to genetic abnormalities and chromosomal changes in the body, and only after the genetic abnormalities and chromosomal changes reach a certain level will leukemia occur.