People with brain injury typically have what symptoms?

Big spectrum. It all depends what part of the cerebrum and brain stem are involved in the trauma and what kind of lesion was produced by the trauma: 1. A collection of blood between the brain and the skull can produce seizures, paralysis of the contralateral side, and death from compression of vital structures. A conrtusion (bruising) of the brain can also produce seizures, and paralysis but it may recover.
Concussion. Headache, dizziness, seeing lights, unsteadiness, poor memory, inability to answer simple questions. Can't concentrate.