>Most brain tumors form in people without any known risk factors. But some factors may increase your risk for brain tumors, such as:
>Radiation exposure. People who have had radiation to the head are at higher risk for brain tumors. Most often this exposure comes from radiation therapy used to treat another type of cancer, like leukemia during childhood.
>Certain inherited syndromes. People who are born with certain syndromes, such as neurofibromatosis, von Hippel-Lindau disease, Li-Fraumeni syndrome, and tuberous sclerosis, have an increased risk of brain tumors.
>Family history of brain tumors. Most people with brain tumors don’t have a family history of the disease. But in rare cases, tumors can run in families.
>Weak immune system. People who have a weak immune system have a higher risk of developing central nervous system lymphoma. This includes people who have AIDS or who have had an organ transplant.
>Radiation exposure. People who have had radiation to the head are at higher risk for brain tumors. Most often this exposure comes from radiation therapy used to treat another type of cancer, like leukemia during childhood.
Conclusion
Exposure to some dental x-rays performed in the past, when radiation exposure was greater than in the current era, appears to be associated with increased risk of intra-cranial meningioma.
Some of this may deserve more research before warranting belief.
>Our ability to detect an exercise-brain cancer relationship may relate to the use of cohorts specifically designed to detect exercise-health associations
>Radiation exposure. People who have had radiation to the head are at higher risk for brain tumors. Most often this exposure comes from radiation therapy used to treat another type of cancer, like leukemia during childhood.
>Certain inherited syndromes. People who are born with certain syndromes, such as neurofibromatosis, von Hippel-Lindau disease, Li-Fraumeni syndrome, and tuberous sclerosis, have an increased risk of brain tumors.
>Family history of brain tumors. Most people with brain tumors don’t have a family history of the disease. But in rare cases, tumors can run in families.
>Weak immune system. People who have a weak immune system have a higher risk of developing central nervous system lymphoma. This includes people who have AIDS or who have had an organ transplant.
https://www.urmc.rochester.edu/encyclopedia/content.aspx?con...
This one is really promising:
>A study found that people who walked or ran at least 1.8 MET·h·d had a 42.5% lower risk of fatal brain cancer.
https://pubmed.ncbi.nlm.nih.gov/24091993/