The exact cause of primary brain tumours are not yet fully-documented. Most brain tumours develop from uncontrolled, abnormal growth in the brain cells. Some factors can increase the risk of developing primary brain tumours, including:
- Exposure to high doses of ionising radiation (used to treat another cancer)
- Gender (males are at higher risk)
- Increasing age (over 65)
- Race (Caucasians are at higher risk)
In addition, some hereditary factors increase your risk of developing a brain tumour, like neurofibromatosis, which is an inherited condition that affects the development and growth of nerve cells. The risks also increase if a person has a weakened immune system (eg. due to AIDS). So far, there has been no documented evidence to prove that use of mobile phones and microwave ovens can cause brain tumours.