Concussion signs: How to Spot the Red Flags and When to Seek Help
Whether it happens on the football pitch, in a car accident, or from a simple trip at home, a head injury can be a frightening experience. While most bumps to the head are minor, some can result in a concussion—a type of traumatic brain injury (TBI) that affects how your brain functions. Because the brain is soft and cushioned by spinal fluid, a sudden jolt can cause it to bounce or twist inside the skull, creating chemical changes and sometimes stretching or damaging brain cells.
Recognising concussion signs early is vital for ensuring a safe recovery time and preventing further injury. While many people think you have to lose consciousness to have a concussion, that is actually a common misconception. In fact, most concussions occur without any loss of consciousness at all.
The Common Physical Concussion Signs
Physical symptoms are often the first things people notice following brain trauma. These signs can appear immediately, or they might develop several hours or even days after the initial impact. If you or a loved one has suffered a head knock, keep a close eye out for these physical indicators:
- Headache or “pressure”: This is the most frequently reported symptom.
- Nausea or vomiting: Often occurring shortly after the injury.
- Dizziness: A feeling of instability or being off-balance.
- Blurred vision: Or seeing “stars” or double vision.
- Sensitive to light: Photophobia, where normal room light feels painful.
- Sensitive to noise: Feeling overwhelmed by everyday sounds.
- Fatigue: Feeling unusually tired or “drowsy.”
According to the NHS, it is important to monitor these symptoms closely, as they can fluctuate during the first 24 to 48 hours.
Cognitive and Emotional Symptoms
A concussion doesn’t just affect the body; it impacts the mind. You might notice subtle changes in how a person thinks or feels. These head injury symptoms are sometimes harder to spot but are just as significant. Common signs of cognitive impairment include:
- Feeling “foggy”: A sensation of mental slowness or lack of clarity.
- Difficulty concentrating: Struggling to follow a conversation or complete simple tasks.
- Memory loss: Specifically, amnesia regarding the event that caused the injury.
- Delayed response: Taking longer than usual to answer questions.
- Irritability: Sudden changes in mood or personality.
If these symptoms persist for weeks or months, it may indicate post-concussion syndrome, which requires specialised medical attention.
Concussion Signs in Children and Infants
Detecting a concussion in very young children can be challenging because they cannot always describe how they feel. Caregivers should look for changes in behaviour. The Royal College of Paediatrics and Child Health suggests watching for:
- Excessive crying or inability to be consoled.
- Changes in nursing or eating habits.
- Loss of interest in favourite toys.
- Loss of balance or unsteady walking.
- Seizures.
If you notice any of these signs in a child after a fall, seek a neurological assessment from a healthcare professional immediately.
Comparing Concussion Severity
While every brain injury is unique, medical professionals often categorise symptoms to determine the level of care needed. The following table provides a general overview of symptom progression.
| Symptom Category | Mild Indicators | Red Flags (Emergency) |
|---|---|---|
| Physical | Mild headache, slight nausea | Repeated vomiting, seizures, one pupil larger than the other |
| Cognitive | Temporary confusion, dizziness | Inability to recognise people, extreme disorientation |
| Sleep/Energy | Sleeping more than usual | Inability to wake up or stay awake |
| Motor Skills | Slight clumsiness | Slurred speech, weakness, or numbness |
For more detailed triage information, you can consult the NICE guidelines on head injury management.
When to Seek Emergency Care
In some cases, a head injury can lead to a medical emergency such as a haematoma (bleeding on the brain) that crowds the brain tissue against the skull. You should call 999 or visit the nearest A&E if the person experiences:
- Loss of consciousness for any amount of time.
- A headache that gets worse and does not go away.
- Weakness, numbness, or decreased coordination.
- Repeated vomiting or nausea.
- Slurred speech.
- Extreme drowsiness or inability to wake up.
- One pupil (the black centre of the eye) is larger than the other.
- Convulsions or seizures.
- Inability to recognise people or places.
- Increasing confusion, restlessness, or agitation.
Authoritative sources like the Mayo Clinic and CDC Heads Up emphasise that “when in doubt, get checked out.”
Recovery and Returning to Play
Recovery from a concussion requires both physical and cognitive rest. This means avoiding strenuous exercise as well as activities that require intense concentration, such as video games, reading, or working on a computer. For athletes, a sports-related concussion requires a graduated return-to-play programme.
Organisations like England Rugby provide specific protocols for returning to sport safely. Prematurely returning to activity can increase the risk of “Second Impact Syndrome,” a rare but potentially fatal condition. Research published in Nature highlights that the brain remains vulnerable during the initial recovery phase even if the primary concussion signs have seemingly vanished.
You can find further guidance on first aid for head injuries through St John Ambulance and Bupa. For those navigating long-term recovery, resources at Johns Hopkins Medicine and BrainLine offer excellent support. Additionally, global perspectives on management can be found via Healthdirect and research insights from University College London or the BMJ.
Frequently Asked Questions (FAQs)
How long do concussion signs usually last?
Most people recover from a concussion within 7 to 10 days. However, for some, symptoms can persist for several weeks or months. If symptoms do not improve within a fortnight, it is important to consult a doctor to rule out more serious issues.
Can I sleep if I have a concussion?
In the past, people were told to stay awake after a head injury. Modern medical advice suggests that sleep is actually beneficial for brain recovery. However, a responsible adult should monitor the injured person for the first 24 hours to ensure they can be easily woken and are not showing worsening symptoms.
Do concussion signs always appear immediately?
No. While many signs appear right away, some can be delayed. Emotional changes, sleep disturbances, and memory loss may not become apparent until the person attempts to return to their normal daily routine.
