Concussion Myths: Debunked! What’s Actually True After a Concussion?
Concussion is a hot topic—and with all the attention comes a lot of misinformation.
Patients and families are often given conflicting advice about what to do after a concussion. Should you stay in a dark room? Should you avoid exercise? Do you need to lose consciousness to have a concussion? Does a normal CT scan mean you're fine?
The answers aren't always as simple as they seem.
A concussion is a mild traumatic brain injury (mTBI), and recovery can look different from person to person. Understanding what is—and isn't—supported by current evidence can help you make better decisions about care.
We've rounded up some of the most common concussion myths we hear and what the current evidence tells us instead.
If you are looking for a broader overview of what to do after a concussion, start with our Concussion Care Matters: What to Do After a Concussion.
Myth #1: You need complete rest until your symptoms go away.
False.
This is one of the most common pieces of concussion advice—and one that has changed significantly as our understanding of concussion recovery has evolved.
A short period of relative rest—generally about 24–48 hours after the injury—is appropriate. But current concussion guidance does not recommend staying in bed or avoiding all physical and cognitive activity until symptoms completely disappear.
After that initial period, people are generally encouraged to gradually resume daily activities and light physical activity as tolerated. Activities should remain symptom-limited, meaning they should not cause a significant or prolonged worsening of symptoms.
This doesn't mean you should push through severe symptoms. It means that more activity isn't necessarily worse—and complete inactivity isn't necessarily better.
If you've been told to simply "rest until you feel better" without a plan for gradually returning to activity, it may be worth seeking an evaluation from a provider with specialized concussion training.
Related: Physical Activity After Concussion: When and How Much?
Myth #2: You should stay in a dark room until you feel better.
False.
The "dark room" approach is an extension of the old idea that the best way to recover from concussion is to eliminate as much stimulation as possible.
While reducing overwhelming stimulation can be helpful early on—especially if light, noise, or screens aggravate symptoms—complete isolation and sensory deprivation are not recommended as a treatment strategy.
Current guidance recommends relative rest during the first 24–48 hours, followed by a gradual return to everyday activities, including social and cognitive activity as tolerated.
If a certain activity makes your symptoms significantly worse, that is useful information. You may need to modify the activity, take a break, or reduce the intensity rather than eliminating activity altogether.
Recovery is about finding the right level of activity for your individual symptoms, not sitting in a dark room indefinitely.
Myth #3: You have to hit your head to get a concussion.
False.
A direct blow to the head can absolutely cause a concussion—but it isn't required.
A concussion can occur after a bump, blow, or jolt to the head or body that causes the brain to move rapidly within the skull. This can happen during a fall, collision, tackle, whiplash-type injury, motor vehicle crash, or other event where the head and brain experience rapid acceleration or deceleration.
In other words, you don't have to hit your head for your brain to be injured.
This is one reason it is important to pay attention to symptoms after any significant impact or jolt—not just when there is a visible injury to the head.
Myth #4: If you didn't lose consciousness, you didn't have a concussion.
False.
Loss of consciousness is not required for a concussion.
In fact, most people who sustain a concussion do not lose consciousness.
Concussion is diagnosed based on the circumstances of the injury, symptoms, signs, and clinical evaluation—not simply whether someone "blacked out."
Someone can remain fully conscious after an injury and still experience headaches, dizziness, nausea, balance problems, vision changes, brain fog, memory problems, fatigue, or other symptoms associated with concussion.
Myth #5: Helmets prevent concussions.
False—but this one needs some nuance.
Helmets are extremely important. They can reduce the risk of serious head injury and skull fracture and are an important part of sports and recreational safety.
But there is no concussion-proof helmet.
A concussion can occur when forces cause the brain to move rapidly inside the skull, and wearing a helmet does not eliminate that possibility. The CDC specifically cautions against products that claim to prevent all concussions.
So don't skip the helmet. Wear the appropriate, properly fitted helmet for activities where one is recommended—but don't assume that wearing one makes you immune to concussion.
Myth #6: Exercise is dangerous after a concussion.
False.
For years, people were told to avoid exercise until all concussion symptoms disappeared. Current evidence has changed that approach.
After an initial period of relative rest, light physical activity can be introduced as tolerated, and appropriately prescribed aerobic exercise can actually be part of concussion rehabilitation.
The key is how much and how soon.
Exercise should initially stay below the level that significantly exacerbates symptoms. As recovery progresses, activity can be gradually increased based on an individual's symptoms and exercise tolerance.
For some patients, a trained physical therapist or athletic trainer may use a graded exercise assessment—such as the Buffalo Concussion Treadmill Test—to help determine an appropriate exercise intensity.
Myth #7: One provider can treat every aspect of a concussion.
Not necessarily—and this is an important one.
Concussion can affect multiple systems at once. One person may primarily experience headaches and neck pain, while another may struggle with dizziness, vision problems, exercise intolerance, brain fog, sleep disruption, or emotional changes.
Because symptoms can involve different systems, some patients benefit from a multidisciplinary approach to concussion care.
Depending on the individual's needs, a care team might include physicians, physical therapists, cognitive rehabilitation specialists, neuro-optometrists, psychologists, athletic trainers, and other specialists.
Not every patient needs every type of treatment. The goal is an individualized plan based on the symptoms and impairments identified during evaluation.
Be cautious of anyone who promises to "fix" every aspect of a concussion with a single treatment or approach.
Related: Four Ways Physical Therapy Can Help With Post-Concussive Symptoms
Myth #8: Dizziness after concussion is always a vestibular problem.
False.
The vestibular system plays an important role in balance, spatial orientation, and eye movements, and vestibular dysfunction is a common contributor to dizziness after concussion.
But it isn't the only possibility.
Dizziness can involve multiple systems, including the:
Vestibular system
Visual system
Cervical spine
Autonomic/physiological system
That means two people can both report "dizziness" while having completely different underlying contributors.
A comprehensive concussion evaluation should consider the different systems that may be contributing to a person's symptoms rather than assuming every case of dizziness is simply a vestibular problem.
Related: Why You Need a Thorough Neuro-Optometry Evaluation if You're Having Vision Problems After a Concussion
Myth #9: Concussion symptoms always happen immediately.
False.
Some people develop symptoms immediately after an injury. Others don't.
Concussion symptoms can evolve over minutes or hours, and some symptoms may not become apparent until later. The CDC notes that symptoms can appear right away or may not show up for hours or even days after an injury.
That means feeling fine immediately after an impact doesn't necessarily mean you're in the clear.
Pay attention to changes in how you feel, think, move, sleep, or behave in the hours and days following an injury.
And if symptoms are severe, worsening, or accompanied by emergency warning signs, seek immediate medical attention.
Myth #10: A normal CT or MRI means you don't have a concussion.
False.
This is an especially important misconception.
A concussion is a functional injury to the brain, and standard structural imaging such as CT or conventional MRI is often normal following a concussion. The 2023 Amsterdam International Consensus Statement notes that no abnormality is typically seen on standard structural neuro-imaging in sport-related concussion.
A CT scan may be used when a healthcare provider is concerned about a more serious injury, such as bleeding or a skull fracture. A normal scan can be reassuring in that context—but it does not rule out concussion.
So,
Normal imaging ≠ no concussion.
Diagnosis relies on the history of the injury, symptoms, signs, and clinical evaluation.
Myth #11: You have to be an athlete to get a concussion.
False.
Concussions certainly receive a lot of attention in sports, but you don't have to play sports to sustain one.
Falls, motor vehicle crashes, cycling accidents, workplace injuries, recreational activities, and other impacts or jolts can all result in a concussion. A concussion can occur whenever an injury causes the brain to move rapidly within the skull.
This is why concussion care isn't just for athletes.
Children, adults, older adults, workers, students, and anyone else who experiences a significant impact or jolt can potentially sustain a concussion.
Myth #12: If you feel better, you can immediately return to sports.
Not necessarily.
Feeling better is an important part of recovery—but for athletes, returning to sport is a process, not a single decision.
Current concussion guidance recommends a graduated return-to-sport progression. Athletes can begin symptom-limited activity early in recovery, but later stages involve increasingly demanding physical activity and, eventually, activities that may carry a risk of head impact. Those later stages should occur with appropriate clinical oversight and after the athlete has recovered sufficiently to safely participate.
In other words, feeling better doesn't necessarily mean you're ready to go straight back into competition.
A gradual progression gives clinicians, athletes, parents, and coaches an opportunity to identify problems before an athlete returns to unrestricted play.
Related: Are Return to Play Protocols Sufficient?
The Bottom Line
There is still a lot we don't know about concussion, but our understanding of these injuries—and how to manage them—continues to evolve.
What we do know is that concussion is not simply a "rest until you feel better" injury. Recovery is individualized, and symptoms can involve multiple systems, including physical, cognitive, visual, vestibular, physiological, and emotional systems.
That's why getting the right evaluation matters.
At Colorado Concussion Clinic, our goal is to provide evidence-based, individualized concussion care and help patients understand what is happening throughout their recovery.
If you or someone you care about has sustained a concussion and isn't feeling right, you don't necessarily have to wait it out.
References
Patricios JS, et al. Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport—Amsterdam, October 2022. British Journal of Sports Medicine. 2023.
Centers for Disease Control and Prevention. Symptoms of Mild TBI and Concussion. 2025.
Centers for Disease Control and Prevention. About Mild TBI and Concussion. 2025.
Centers for Disease Control and Prevention. What to Do After a Mild TBI or Concussion. 2025.
Centers for Disease Control and Prevention. Safety Guidelines: Helmets. 2025.
Originally published March 16, 2021. Updated August 2026.
This article has been updated to reflect current concussion research and clinical guidance.
Medical Disclaimer: This article is provided for educational purposes only and is not intended to replace medical advice, diagnosis, or treatment from a qualified healthcare professional. Concussion symptoms and recovery can vary from person to person. If you have experienced a head injury or are concerned about your symptoms, consult an appropriate healthcare professional for individualized evaluation and guidance.