Clinical causes of glioma include genetic factors, environmental carcinogenic factors such as ionizing radiation, viral infections and so on. Glioma is a kind of malignant tumor that occurs in the brain and originates from glial cells, and it is a kind of malignant tumor that is more common in the brain. The specific etiology is still unclear, but the following factors are considered to be closely related to the development of glioma. 1. The occurrence of glioma is considered to be related to the existence of abnormal mutation of genes, or suffering from genetic diseases such as neurofibromatosis, which also increases the incidence of glioma. 2. Frequent exposure of the brain to electromagnetic radiation or radiation exposure also increases the risk of glioma. 3. The occurrence of viral infections such as cytomegalovirus is also associated with the formation of gliomas.