You Don't Have to Hit Your Head to Get a Concussion

"I'm fine, I never even hit my head." We hear this constantly at our Burlington clinic, usually from someone describing a rear-end collision, a hard fall onto their backside, or a hit that snapped their neck but never touched their skull.

It's one of the most common and most costly misconceptions in concussion care. You do not need a direct blow to the head to sustain a concussion — and believing otherwise is a major reason people delay getting assessed.

Can You Get a Concussion Without Hitting Your Head?

Yes. The Centers for Disease Control and Prevention defines concussion as a traumatic biomechanical force to the head — and that force can come from a direct hit, or it can be transmitted indirectly from somewhere else in the body. The American Academy of Pediatrics describes it the same way: a blow to the head, face, or neck, or a blow elsewhere on the body that creates an "impulsive" force carried up to the head.

Your brain sits inside your skull, cushioned in fluid. It doesn't need to be struck directly to move. Sudden acceleration, deceleration, or rotational force — the kind that happens in a car collision, a hard tackle, or a fall — can make the brain shift and twist inside the skull. That twisting can stretch and shear neurons even when nothing ever touched your head.

This isn't theoretical. Research on collegiate football has measured linear and rotational head accelerations from torso impacts — where the head was never struck — that matched the forces seen in direct head impacts. The mechanism doesn't require contact. It requires force and motion.

Why Does 'I Didn't Hit My Head' Delay Concussion Care?

This misconception has real consequences. Research suggests roughly half of concussions go undisclosed and undiagnosed, and two-thirds of people who are eventually diagnosed delayed seeking care in the first place. Among people who said they wouldn't seek care at all, the single biggest reason — cited by 41% — was that they didn't believe their injury was serious enough.

Concussion also has one of the highest rates of delayed care-seeking of any injury type studied. There's a second misconception layered on top of the first: the belief that concussion symptoms always show up immediately. They don't. Some symptoms start the moment of impact; others — brain fog, fatigue, sensitivity to light or noise — can take hours or even days to surface.

Why Concussion and Whiplash So Often Overlap

Concussion and whiplash have a lot more in common than most people realize, and that overlap matters clinically. A concussion typically requires somewhere in the range of 70-120 G's of acceleration. A neck injury can occur with as little as 4.5 G's. Since the head and neck move together — they can't accelerate independently of one another — nearly every concussion carries at least some risk of an underlying neck injury, and many whiplash injuries carry a real chance of concurrent concussion.

A 2021 systematic review went further, suggesting whiplash and mild traumatic brain injury share so much overlap in symptoms and mechanism that they may sit on a spectrum rather than being two cleanly separate conditions. Headache, nausea, dizziness, balance problems, blurred vision, and brain fog show up in both. In the early days after an injury, it can be genuinely difficult — even for an experienced clinician — to tell where the neck injury ends and the concussion begins. Current clinical guidance is to treat it as a possible concussion until proven otherwise whenever there's a plausible mechanism and concussion-like symptoms, rather than waiting for certainty.​

This is exactly why neck assessment is now considered a core part of comprehensive concussion management, not a separate afterthought. If you'd like more detail on how this plays out specifically after a collision, we've written about why concussion symptoms get missed after a car accident and what the first six weeks of whiplash recovery typically look like.

What Are the Signs, If Not a Bump on the Head?

According to the CDC, the signs to watch for after any jolt, blow, or sudden force to the head or body include:

• Headache or pressure in the head
• Nausea or vomiting
• Balance problems or dizziness
• Fatigue or feeling sluggish
• Blurred or double vision
• Sensitivity to light or noise
• Difficulty concentrating or "brain fog"
• Simply not feeling like yourself

That last one matters more than people give it credit for. The CDC specifically notes that someone who just says they "don't feel right" after an impact may have a concussion, even without a single other symptom on the list. If something feels off after a collision, fall, or hard jolt, that's worth paying attention to — not dismissing because your head never made contact with anything. We go into the different dizziness and balance patterns in more detail in this guide to dizziness after concussion.

What Does a Concussion Assessment Involve in Burlington?

Because concussion and neck injury overlap so closely, a proper assessment needs to look at both. At our Burlington concussion clinic, that means going through the mechanism of injury, any risk factors that could affect recovery, your clinical history, and your current symptoms — looking carefully at both the head and the neck, since treating one without the other tends to leave gaps in recovery.

If you've been in a motor vehicle collision, this kind of combined assessment is particularly important, since whiplash-type forces are exactly the mechanism most likely to produce a concussion without any visible head impact. Our motor vehicle accident rehab program is set up to assess both injuries together rather than treating them as unrelated. You can also read more about what concussion physiotherapy actually looks like, visit by visit, if you're wondering what to expect before booking.

This article is for educational purposes and doesn't replace an assessment by a qualified health professional.

If there's been a collision, a fall, or a sudden jolt — even one that never touched your head — it's worth getting checked rather than waiting to see if symptoms settle on their own. An assessment at OMNI Health and Rehab includes a review of how the injury happened, a check of both head and neck symptoms, and a plan built around what we find, not a generic protocol. We direct bill most extended health plans, so cost isn't a barrier to getting assessed early. You can book a concussion assessment directly online.