Auto injuries can take many forms, so the symptoms can be varied. A person involved in a car crash may suffer from whiplash, concussion, torn rotator cuff, and more. Below are some of the symptoms to look out for if you are involved in a car accident: Pain in the back, shoulders, neck, arms, and head. Dizziness and nausea. Inability to focus and difficulty remembering things. Insomnia. Stiffness in the muscles and reduced mobility.