Hi, thank you for posting your question here at Brainly.
A patient can sue a physician when he is harmed due to improper health treatment. This should be brought about by negligence such as misdiagnosis, prescription errors, surgery errors and many more.
Explanation: PTSD is a psychiatric disorder that occurs to people after a traumatic experience. Since Sam survived a very bad car crash, he is traumatized and should seek professional help.