In clinical practice, the etiology of gliomas is not very clear. It is not as straightforward as how smoking can easily lead to lung cancer or how cirrhosis can easily lead to liver cancer; many factors are speculative. For example, the most common theory in clinical practice involves genetics. Any form of genetic mutation or chromosomal mutation can induce the development of a glioma. For instance, excessive radiation exposure and drug abuse, and even maternal-fetal transmission or a genetic predisposition, could cause chromosomal abnormalities in patients, potentially leading to the formation of gliomas. However, the most fundamental cause has not yet been clearly identified.