Most brain tumors are not linked with any known risk factors and have no obvious cause. But there are a few factors that can raise the risk of brain tumors. Even if a person has a risk factor, it is often very hard to know how much it contributed to the tumor. Radiation exposure The best known environmental risk factor for brain tumors is radiation exposure, most often from radiation therapy to treat some other condition., Before the risks of radiation were known, children with ringworm of the scalp (a fungal infection) were sometimes treated with low-dose radiation therapy, which was later found to increase their risk of brain tumors as they got older.
Nowadays most radiation-induced brain tumors are caused by radiation to the head given to treat other cancers esp treatment for leukemia. These brain tumors usually develop around 10 to 15 years after the radiation. Radiation-induced…
