A concussion is a ‘minor traumatic brain injury’. You don’t have to lose consciousness to suffer a concussion. A concussion can occur as a result of an impact to your head (e.g. hitting the headrest on your car seat) or simply having your head go forwards and backwards quickly (e.g. a ‘whiplash’ type of motion as in a rear-end collision). Concussions are not usually life-threatening but can result in long-term headaches, vertigo or dizziness.

Make sure that you see a medical doctor as soon as possible.

If the concussion is resulting in headaches, often your doctor will recommend over-the-counter pain relievers such as ibuprofen or acetaminophen. Typically there is also a prescription that you refrain from sports, work, driving and any strenuous activity. If there is a concern about serious symptoms, an MRI scan or CT scan of your brain may be arranged.
From a legal perspective, the most important issue is to get the symptoms assessed by a medical doctor as soon as possible after the collision and ensure that you describe in as much detail as possible and describe how the symptoms are affecting your activities of daily living.

If your symptoms continue, ask your doctor for a referral to a neurologist.