Primary Brain Tumors
In adults, the most common tumors that start in the brain are meningiomas and gliomas.
Meningiomas make up more than 35% of all primary brain tumors. They don't grow from brain tissue itself, but from cells in the brain's covering. Their non-cancerous location and growth make them serious.
The most common cancerous brain tumors -- almost 1 in 5 -- are glioblastomas. They're a type of glioma, tumors that start in your glial cells. They spread quickly and are often fatal.
Overall, there's an increase in people being diagnosed with brain tumors. That may be in part because technology makes them easier to see. But researchers are also looking into other possible causes, such as things in the environment.