Brain Tumor Signs and Symptoms You Should Not Ignore A brain tumor develops when abnormal cells grow inside the brain or nearby structures. These tumors can be benign (non-cancerous) or malignant (cancerous). Since the brain controls vital body functions, even a small tumor can cause noticeable symptoms. Recognizing early warning signs of a brain tumor is critical for timely diagnosis and treatment. Why Do Brain Tumor Symptoms Occur? → Increased pressure inside the skull → Compression of nearby