We don't know exactly what causes brain tumors, but studies do suggest that there may be many factors that play a role in their development. Risk factors for brain tumors include:- exposure to radiation
- family history of certain genetic disorders like neurofibromatosis, tuberous sclerosis, Von Hippel-Lindau disease, and Li-Fraumeni syndrome
- having a compromised immune system (more so associated with CNS lymphomas and people infected with AIDS)
There are many unproven causes and risk factors that are being studies. Cell phone use and the consumption of aspartame are two very controversial topics that some believe may cause brain cancer. These are simply theories and still remain unproven despite the many studies that have been conducted on the subjects.
source : cancer.about.com
source : cancer.about.com
