Recognize concussion danger signs first
Call 911 or go to an emergency department for a worsening headache that does not go away, repeated vomiting, seizure, slurred speech, unusual behavior, increasing confusion, weakness, numbness, reduced coordination, one pupil larger than the other, loss of consciousness, or inability to wake. These are among the adult danger signs listed by the CDC. Do not drive yourself if alertness, vision, balance, reaction time, or thinking is affected. Ask someone else to help or use emergency services.
Neck pain can occur at the same time as a concussion. One symptom should not distract from another, and a routine musculoskeletal appointment should not replace urgent medical evaluation when brain-injury warning signs are present.
A direct head strike is not required
A concussion is a type of traumatic brain injury. CDC HEADS UP explains that a bump, blow, or jolt to the head or body can cause the brain to move within the skull. In a rear-end collision, the torso and head can move quickly as the vehicle changes speed. Whether that movement caused a concussion cannot be determined from impact direction, vehicle damage, or the presence of a head strike alone.
Loss of consciousness is not required for a concussion. A clinician evaluates the event together with symptoms, neurological findings, and other relevant injuries.
Symptoms can change over the next several days
Possible symptoms include headache, dizziness, nausea, vision problems, sensitivity to light or noise, fatigue, balance trouble, feeling slowed down, memory or concentration problems, mood changes, and sleep changes. The pattern differs from person to person. The CDC notes that some mild traumatic brain injury symptoms appear immediately while others emerge hours or days later. Write down when each symptom began and whether ordinary tasks such as reading, screen use, walking, working, or driving make it worse.
A symptom list is not a diagnosis. Other injuries and medical conditions can produce overlapping complaints, so report the complete pattern to an appropriate medical professional. MedlinePlus provides a general concussion overview.
Follow individualized recovery instructions
If a clinician diagnoses or suspects a mild traumatic brain injury, ask for written instructions about rest, return to work, driving, exercise, and activities that could cause another head injury. The CDC recovery guidance recommends easing back into regular activities after a short initial period and reducing an activity if symptoms worsen. Your clinician's instructions should account for your symptoms and other injuries.
Avoid another blow to the head during recovery. Tell the clinician if symptoms are getting worse or are not improving as expected.
Prepare for follow-up with a clear timeline
Record the collision date, whether your head struck anything, any loss of consciousness or memory gap, and the first time each symptom was noticed. Include medications, earlier concussions, and any emergency or urgent-care records. Use specific functional examples at follow-up. Trouble reading for ten minutes, becoming dizzy when walking, or being unable to tolerate a normal work screen gives more information than saying you feel off.
Return for urgent care if a danger sign appears later. Otherwise, use the written recovery plan and current medical findings to decide when it is safe to resume driving, work, exercise, and other demanding activities.
A rear-end impact can cause a concussion without a direct blow to the head. Watch for danger signs, document changes, and use medical guidance for return to normal activity.
References
About the contributors
Editorial team
ChiropracticMatch Editorial Team
The ChiropracticMatch Editorial Team creates and maintains general educational guides about accident-related care questions, local search, appointments, and insurance conversations. ChiropracticMatch is not a healthcare provider and does not provide medical advice.