Brain cancer occurs when abnormal cells in the brain grow uncontrollably, forming a tumor that can interfere with normal brain function. Tumors can be:

• Primary Brain Tumors – Originate in the brain and do not spread to other body parts (e.g., glioblastoma, meningioma, astrocytoma).
• Secondary (Metastatic) Brain Tumors – Cancer that has spread from other organs, such as the lungs, breast, or colon, to the brain.

Brain tumors are classified as benign (non-cancerous) or malignant (cancerous), with malignant tumors being more aggressive and potentially life-threatening.