Could you tell me what are long term effects from a bad head injury?

Brain injury: Brain injury can cause many different types of cognitive and emotional deficits. The first step is to establish what the deficits are by having a neuropsychological evaluation. Then speech and cognitive therapists will help provide exercises and routines to improve or manage these deficits.

Brain injury: In addition to cognitive and/or emotional problems, other damage could manifest as weakness/paralysis, nerve deficits/sensory loss, seizures, hydrocephalus, and even things like ventilator dependence or need for a feeding tube.