A family member  sustained no physical injuries in a recent MVA although his blood pressure and heart rate are elevated. He stated that at the time of the accident he felt a high level of fear and noticed that he had goose bumps and was sweating profusely. Currently, he reports feeling constipated. What  mechanics of his physiological reaction to the stressful experience of an automobile accident has affected the autonomic nervous system that is responsible for his symptoms.
Thanks for your question on Chat Doctor. I can understand your concern. These symptoms are common after motor vehicular accident (MVA) and known as post-traumatic stress disorder (PTSD). The basic etiology behind this is sympathetic over activity. This causes a Chat Doctor.