TBI symptoms vary depending on the extent of the injury and the area of the brain affected. Some symptoms appear immediately; others may appear several days or even weeks later. A person with TBI may or may not lose consciousness—loss of consciousness is not always a sign of severe TBI. * A person with a mild TBI may experience: Headache. Confusion. Lightheadedness. Dizziness. Blurred vision. * A person with moderate or severe TBI may have some of the symptoms listed above. In addition, the person may experience any of the following: Headache that gets worse or won’t go away. Repeated vomiting or nausea. Slurred speech. Convulsions or seizures. An inability to wake up from sleep. (Nih.gov)
