A brain tumor is an abnormal growth of cells in the brain. These tumors can be either benign (non-cancerous) or malignant (cancerous). They can develop in various parts of the brain and may affect how the brain functions, leading to symptoms like headaches, seizures, or changes in vision. The exact cause of brain tumors is often unknown, but certain factors, such as genetic predisposition and exposure to radiation, may increase the risk. Diagnosis typically involves imaging tests like MRI or CT scans, and treatment options may include surgery, radiation therapy, or chemotherapy, depending on the tumor type and location.