A:A person with a moderate or severe traumatic brain injury (TBI) may show these same symptoms, but may also have a headache that gets worse or does not go away; repeated vomiting or nausea; convulsions or seizures; an inability to awaken from sleep; dilation of one or both pupils of the eyes; slurred speech; weakness or numbness in the extremities; loss of coordination; and increased confusion, restlessness, or agitation.