Brain tumors are any type of abnormal growth of cells in the brain, which may or may not be cancerous, but can grow and put pressure on parts of the brain, causing personality, hearing, and hormonal changes, as well as seizures, balance difficulties, and headaches. Computed Axial Tomography (CT) and Magnetic Resonance Imaging (MRI) scans, as well as biopsies, will help your doctor diagnose such a tumor and determine how to treat it. Treatment usually includes surgery.