Langerhans’ histiocytosis is not a malignant tumor, but it has certain characteristics of a tumor itself, which causes abnormalities in the functioning of multiple systems throughout the body. Langerhans’ histiocytosis is a genetic abnormality, which leads to the abnormal proliferation of dendritic cells in the monocyte-macrophage system, resulting in a multisystemic disease that mainly affects the lungs, kidneys, bones, and blood vessels. It is classified as eosinophilic granuloma, Leukocytosis, or Han-Schön-Koch disease, and is not a malignant tumor. Langerhans’ histiocytosis requires prompt medical observation and standardized treatment under the guidance of clinicians after diagnosis to prevent irreversible damage.