A meningioma is a slow-growing tumor that forms in the lining covering the brain and spinal cord. Because it creeps along quietly, symptoms often show up only when the tumor pushes on nearby nerves or brain tissue. The exact signs depend on where the tumor sits and how big it gets. The most common complaints are new headaches that don’t feel like your usual ones—steady, dull, and often worse in the morning. Vision may blur or double; you might notice frequent bumps into door frames because your side vision is fading. Hearing changes, ringing in one ear, or feeling off-balance... Learn more