The Coach's Concussion Playbook: Sideline Recognition, Response, and Return Protocols

A 15-year-old soccer player goes up for a header. She wins it, lands awkwardly, stumbles two steps, then steadies herself. Her teammates clap. She jogs back into position and says, "I'm fine." She's not. And if you — her coach — wave her back in without a closer look, you might be ending her season. Or worse, you might be putting her life at risk.

This isn't hypothetical fear-mongering. Between 1.6 and 3.8 million sports-related concussions occur every year in the United States, according to research cited by the CDC's HEADS UP program . Up to 50% of those concussions go unreported. Young athletes hide symptoms because they don't want to let their team down, because they don't recognize what's happening, or because the culture around them rewards toughness over honesty. And here's what makes this uniquely dangerous for youth sports: developing brains are more vulnerable to concussive injury and take significantly longer to recover than adult brains. The stakes are not the same as in professional sports. They're higher.

Sideline Recognition: What to Look For

You don't need to be a neurologist to recognize a potential concussion. The SCAT6 (Sport Concussion Assessment Tool, 6th edition) is the gold standard for sideline evaluation, and while the full tool is designed for medical professionals, coaches can — and should — learn its core observable signs. Here's a simplified framework you can use on any sideline, in any sport.

Observable signs — things you can see without asking: a blank or vacant stare, being slow to get up after contact, visible confusion or disorientation, balance problems or stumbling, clutching the head, or any loss of consciousness (even momentary). If you see any of these, the athlete comes out. Period.

Symptoms to ask about — pull the athlete aside and ask directly: "Do you have a headache? Are you dizzy? Do you feel pressure in your head? Does anything feel foggy or not right?" Young athletes often won't volunteer this information. You have to ask, and you have to ask clearly.

Quick memory check — ask orientation questions the athlete should easily know: "What venue are we at?" "What half is it?" "Who scored last?" "What team did we play last game?" Incorrect or hesitant answers are a red flag. Don't brush them off as the athlete being "shaken up."

The Golden Rule: When in Doubt, Sit Them Out

This is the single most important sentence in this article: when in doubt, sit them out. No exceptions. No "let them try one more play." No "they seem fine now." Concussion symptoms can evolve over minutes or even hours. An athlete who seems okay 30 seconds after a hit can deteriorate rapidly. The cost of being wrong on the side of caution is one game. The cost of being wrong the other way can be catastrophic.

Second Impact Syndrome: Why Returning Too Early Can Be Fatal

Second Impact Syndrome (SIS) is the most terrifying reason to take concussions seriously. It occurs when an athlete sustains a second concussion before the brain has fully healed from the first. The result can be rapid, catastrophic brain swelling — diffuse cerebral edema — with a mortality rate exceeding 50%. Among survivors, severe permanent disability is the norm, not the exception. SIS is rare, but it is real, and it is almost always preventable. It happens when athletes return to play too soon, often because their initial concussion was missed, minimized, or never properly evaluated. This is why the return-to-sport protocol exists, and why it is non-negotiable.

The 6-Stage Graduated Return-to-Sport Protocol

The international consensus, outlined in the 2023 Consensus Statement on Concussion in Sport , establishes a six-stage graduated return-to-sport (RTS) protocol. Each stage must take a minimum of 24 hours. If symptoms return at any stage, the athlete drops back to the previous asymptomatic stage and restarts the progression from there.

1. Symptom-limited activity. Daily activities that do not provoke symptoms. Complete cognitive and physical rest in the initial period, gradually introducing light activities like walking as tolerated.
2. Light aerobic exercise. Walking, swimming, or stationary cycling at low intensity. No resistance training. The goal is to increase heart rate gradually.
3. Sport-specific exercise. Running drills, skating drills, or other sport-specific movement patterns. No head impact activities. No contact of any kind.
4. Non-contact training drills. More complex drills, passing exe...