Do people with a brain injury see things that arent really there?

Yes: Yes traumatic brain injury can cause or can ake people more prone to hallucinations and delusions depending on extent. There are also medications which can cause this. See your physician for a proper work up.

After traumatic: Brain injury, some patients can experience hallucinations and other psychological conditions. There are some medications that may help. Involvement of a doctor will be helpful.

Poss. but uncommon: Psychosis following head trauma (pdtbi) most patients with pdtbi reported in the literaturefit a similar profile t in that they are male, relatively young at the time of injury, suffer a severe head injury with loss of consciousness, have a several year latency to the first signs of psychosis, and typically present with auditory hallucinations. I hope this helps. Be well.