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In 2009, an estimated 22,070 new brain and other nervous system tumors were diagnosed in the United States. Risk factors for these tumors are unclear. Some factors that may increase risk are:
Age — Brain tumors can occur at any age, but studies show that they are most common in two age groups: children three to 12 years old and adults 40 to 70 years old.
Occupation — Studies show that some types of brain tumors are more frequent among workers in certain industries, such as oil refining, rubber manufacturing, and drug manufacturing. Other studies have shown that chemists and embalmers have a higher incidence of brain tumors.
Radiation exposure — Some studies have connected brain tumors and a specific type of radiation, called ionizing radiation, which typically comes from cancer treatment or exposure to nuclear weapons. More common types of radiation (from electronic devices or power lines) have not been linked to tumors.
Scientists do not believe that head injuries cause brain tumors to develop.
Tumors can be classified into two main types: benign and malignant.
More information about brain tumors are available here.
For definitions of specific types of tumors, click on the links below: