As with tumors elsewhere in the body, the exact cause of most brain tumors is unknown. Genetic factors, various environmental toxins, radiation, and cigarette smoking have all been linked to cancers of the brain, but in most cases, no clear cause can be shown.
The following factors have been proposed as possible risk factors for primary brain tumors. Whether these factors actually increase the risk of a brain tumor is not known for sure.
- Radiation to the head
- An inherited (genetic) risk
- HIV infection
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