Common symptoms associated with car accident injuries include pain in the cervical spine (neck), thoracic (mid-back), and lumbar (low-back) regions, muscle stiffness and spasms, pain in the upper and lower extremities, headaches, blurred vision, memory loss, fatigue, difficulty sleeping, difficulty concentrating, and a number of other symptoms. The most dangerous symptom is one you don’t feel at all. Many times these injuries do not manifest symptoms until months or possibly years down the road, which is why it is critical to have yourself properly examined after a car accident.