Posttraumatic headaches are among the most common somatic complaints following mild head injury. In the past, 79 percent of patients who were evaluated 3 months after minor head injury complained of persistent headaches. Head injuries can result from blunt head trauma during a motor vehicle accident, the mechanism being shearing stresses on the brain set up by rotational torques. The type of damage can range from mild to severe and can include, edema, herniation, laceration, and thrombosis.