Concussion symptoms in children: what to look for and when to act

In the first post in this series, we covered the basics: what a concussion actually is, and why "no knockout" doesn't mean "no injury." This post is about the part that actually matters in the moment - knowing what to look for, and knowing when a symptom stops being something to watch and starts being something to act on.

The four categories of symptoms

Concussion symptoms don't show up as one thing - they cluster into four categories. Thinking of them this way is more useful than scanning a long, undifferentiated list, because it helps you notice a pattern, not just a single complaint.

Physical: a head that aches or feels like it's under pressure, an upset stomach or vomiting, unsteadiness on their feet, vision that's blurry or doubled, and a new sensitivity to bright light or loud sound.

Cognitive: a mind that feels slow, foggy, or hard to focus, general confusion, or trouble recalling exactly what happened around the moment of impact.

Emotional: a child who seems more irritable, tearful, or on-edge than usual, or whose behavior just feels "off" compared to how they normally are - easy to mistake for tiredness rather than injury.¹

Sleep: noticeably more or less sleep than usual, trouble drifting off, or a heaviness during the day that doesn't match how active they've actually been.

One thing worth saying plainly: spotting this in a young child can be harder than in an older athlete or adult, simply because a young child may not have the words to describe what they're feeling. You know what's normal for your child, and what isn't - that instinct is worth trusting.²

The window most parents miss

Here's the detail that catches people off guard: there's no visual way to spot a concussion, and it doesn't always make itself known right away. Some symptoms are obvious within minutes. Others take their time - a full day, sometimes two, before anyone notices anything is wrong.³

That means one glance right after the hit isn't enough. Keep an eye on your child for the better part of the next two to three days after any impact you're unsure about - watching not just for symptoms appearing for the first time, but for anything that seems to be getting worse, or a kid who just doesn't feel like themselves. If they're sleeping after a knock to the head, don't leave that unsupervised - check in on them periodically rather than assuming everything's fine until morning.

This is also exactly the gap real-time impact alerts are built to close - a coach or parent can't watch every player at every second, and a hit that didn't look dramatic in the moment can still be the one that matters.

When this becomes an emergency, not a wait-and-see

Most concussion symptoms don't need a 911 call - they need rest, monitoring, and a proper medical assessment within a day. But a smaller set of signs mean something more serious may be happening, and they need immediate emergency care, not an appointment booked for tomorrow.

If any of these appear, the guidance across every major health authority is consistent and unambiguous: get to an emergency department, by ambulance if necessary. Don't wait to see if it passes.⁴

What to do right now, while you're figuring it out

If you suspect a concussion and you're not yet sure how serious it is, three steps apply regardless:

1. Remove your child from the activity immediately. Don't let them go back in that day - not even if they insist they feel fine twenty minutes later.

2. Get a medical assessment within 24 hours - a GP, a sports medicine physician, or an emergency department if any red flag above is present.

3. Keep watching. If symptoms get worse at any point - even after you've already seen a doctor - that's the signal to escalate to emergency care, not to wait for the next scheduled check-in.⁵

If symptoms haven't improved within about two weeks, or anything worsens, it's time to check back in with a doctor rather than assume it'll resolve on its own.⁶

A note on perspective

It's worth saying clearly: knowing this list isn't about assuming the worst every time your child takes a bump. Research consistently shows parents actually overestimate how often concussions happen in youth sport - one 2025 study found the large majority of parents believed youth football concussion rates were far higher than they actually are.⁷ The goal here isn't to make you anxious about every collision. It's to make sure that when something real does happen, you recognize it - and know exactly what to do next.

Next in this series: once a concussion is confirmed, what does recovery actually look like? We'll walk through the real return-to-learn and return-to-play process, step by step.