As with tumors in other parts of the body, the exact cause of most brain tumors is unknown.
The following factors have been proposed as possible risk factors for primary brain tumors, but whether these factors actually increases the risk of a person with a brain tumor is not known with certainty.
Radiation to the head
An inherited (genetic) risk
HIV infection
Smoking
Environmental toxins (eg, chemicals used in oil refineries, embalming chemicals, chemicals in the rubber industry)
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