A knock to the head during football, netball, basketball or cricket doesn’t always show its full effect straight away. Many parents and coaches assume that if a young athlete “seems fine” and walks off the field talking normally, the danger has passed. In reality, concussion symptoms can take hours, or even a day or two, to fully emerge.
Understanding this delayed pattern is one of the most important pieces of concussion education for families and community clubs across the Mornington Peninsula. Knowing what to watch for in the days following a head knock can help you make more informed decisions about rest, return to activity, and when to seek further assessment.
Why concussion symptoms can be delayed
Concussion is a functional brain injury, meaning it disrupts how brain cells communicate rather than causing visible structural damage. This disruption can take time to fully develop. Adrenaline and the excitement of competition can also mask early symptoms, so a young athlete may report feeling “okay” immediately after an impact, only to develop headaches, fogginess or irritability later that evening or the next morning.
This is why recognised frameworks, including those used by Complete Concussions (CCMI) and referenced in AFL concussion guidelines, emphasise ongoing monitoring in the 24 to 72 hours after any suspected head knock, not just an on-field check.
Signs to watch for in the hours and days after a head knock
Parents, coaches and carers are often best placed to notice subtle changes because they know the young person well. Signs that may develop or worsen after the event include:
- Headache that appears or intensifies later in the day
- Dizziness or balance problems, especially with quick movements
- Sensitivity to light or noise
- Nausea or loss of appetite
- Fatigue or needing more sleep than usual
- Difficulty concentrating at school or on schoolwork
- Slower thinking, confusion or memory gaps
- Irritability, low mood or uncharacteristic emotional responses
- Sleep disturbance, including trouble falling asleep or restless sleep
Any one of these on its own may not be alarming, but a cluster of symptoms, or symptoms that are getting worse rather than better, warrants further assessment.
When delayed symptoms need urgent attention
Some signs indicate a more serious injury and require emergency medical care rather than routine follow-up. These include repeated vomiting, worsening headache, seizures, slurred speech, weakness or numbness in the limbs, unusual drowsiness or difficulty waking, and any loss of consciousness. If any of these appear, seek emergency medical attention immediately rather than waiting for a scheduled appointment.
Why monitoring matters more than the sideline check
A brief sideline assessment can identify obvious red flags, but it cannot capture how a young athlete’s brain is coping with everyday demands like screen time, schoolwork, noisy classrooms or physical activity over the following days. This is where structured, ongoing concussion testing on the Mornington Peninsula plays a role. Baseline and post-injury testing helps build a clearer picture of recovery over time, supporting more informed decisions rather than relying on how a young person “looks” or “feels” on a single day.
It’s worth noting that no testing process can prevent concussion or guarantee a risk-free return to sport. What structured monitoring does offer is a more consistent, evidence-informed way of tracking recovery alongside guidance from a qualified health professional.
Supporting recovery at home and at school
Families in McCrae, Dromana, Rosebud, Rye and surrounding Mornington Peninsula suburbs are often juggling school, sport and family life while trying to manage a young person’s recovery. Helpful steps include relative rest in the first 24 to 48 hours, gradually reintroducing light activity as tolerated, keeping communication open with teachers about reduced workload, and avoiding a return to contact sport until symptoms have settled and appropriate clearance has been discussed with a health professional.
Osteopaths trained through Complete Concussions frameworks can support this process by helping monitor symptoms, guide graded return to activity, and coordinate with GPs or specialists where needed. If you’re unsure where to start, our page on concussion assessment and management outlines what this process typically involves.
Building awareness across local clubs
Because delayed symptoms are so easy to miss, education for coaches, teachers and parents is just as important as clinical assessment. Community sporting clubs across the Mornington Peninsula are increasingly building concussion awareness into their return-to-play policies, and resources such as our free concussion workshop are designed to help clubs, schools and families understand what to look for and how to respond appropriately.
If your child, player or family member has had a head knock recently, even one that seemed minor at the time, keeping a close eye on how they present over the following days is one of the simplest and most valuable things you can do.
Frequently asked questions
How long after a head knock can concussion symptoms appear?
Symptoms can appear immediately, but it’s common for headaches, fatigue, poor concentration or mood changes to develop or worsen over the following 24 to 72 hours. This is why ongoing observation matters, not just a check straight after the incident.
Should we go to hospital if symptoms appear later, not straight away?
If symptoms such as repeated vomiting, worsening headache, seizures, slurred speech, or unusual drowsiness develop at any point, seek emergency medical attention immediately. Milder, gradually developing symptoms can generally be discussed with a GP or a health professional experienced in concussion management.
Can a young athlete play again if they feel fine the next day?
Feeling fine isn’t a reliable sign that recovery is complete, since symptoms can fluctuate or return with activity. A structured, gradual return-to-play approach guided by a qualified health professional is recommended before resuming contact sport.
What is concussion testing and how does it help?
Concussion testing generally involves assessing symptoms, balance, cognitive function and other markers, sometimes compared against a baseline taken before injury. It supports informed decision-making about recovery and return to activity, though it cannot prevent concussion or guarantee a risk-free return.
Who should monitor a young athlete after a suspected concussion?
Parents, carers, teachers and coaches all play a role in noticing changes in the days after a head knock, alongside guidance from a health professional trained in concussion management, such as an osteopath working within Complete Concussions frameworks.
Concussion testing on the Mornington Peninsula
To learn more or arrange concussion testing, assessment or return-to-play support, visit our concussion testing page or book an appointment online with The Seaside Osteo in McCrae.
This article is general information for Mornington Peninsula families and is not a substitute for individual medical assessment. If you suspect a concussion, seek advice from a qualified health practitioner, and call 000 if there are emergency warning signs.