Radiation therapy used to treat brain cancers increases the risk of brain tumors up to 20 or 30 years later.
Some inherited conditions increase the risk of brain tumors, including neurofibromatosis, Von Hippel-Lindau syndrome, Li-Fraumeni syndrome, and Turcot syndrome.
Exposure to radiation at work or to power lines, as well as head injuries, smoking, and hormone therapy have not been proven to be risk factors.
Studies have found that cell phones, cordless phones, and wireless devices are safe and do not increase the risk.
Lymphomas that begin in the brain in people with a weakened immune system are sometimes linked to infection by the Epstein-Barr virus.