Symptoms of brain injuries vary widely depending on the type and severity of the injury. Indicators of a brain injury may include, but are not limited to: Blurred vision Disorientation Headaches Dizziness Ringing in the earsIn creased sensitivity to light, sound and smell Memory loss Difficulty concentrating Dilation of one or both pupils Nausea or vomiting Seizures Coma People suffering from brain injuries may also experience changes in mood or behavior.