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A football player takes a hard hit, gets back on his feet, and stumbles toward the huddle. No penalty flag was thrown. The tackle was legal. But something is clearly wrong.
This is where a referee’s responsibility goes beyond enforcing the rules.
Concussions are among the most serious injuries in American football, and they do not always result from illegal hits. A player can suffer a concussion after a routine tackle, a collision with another player, or a fall onto the turf. Some athletes show obvious symptoms immediately, while others may appear normal at first.
Referees cannot diagnose brain injuries, but they can recognize warning signs, stop play when appropriate, and ensure that injured players receive medical attention.
Research also shows why safety rules matter. A 2018 study published in JAMA found that concussion rates during Ivy League kickoffs fell substantially following a rule change designed to increase touchbacks. However, other research has produced mixed results, demonstrating that not every safety rule has the same measurable effect.
This guide examines how football officials help prevent concussions, which rules protect players, what published research reveals, and how concussion procedures differ across the NFL, NCAA, and high school football.
What Is a Concussion in Football?
A concussion is a traumatic brain injury caused by a blow or jolt to the head, or an impact elsewhere on the body that causes the head to move rapidly.
These forces can disrupt normal brain function, even when there is no visible injury.
A concussion does not require loss of consciousness. It also does not require direct helmet-to-helmet contact.
According to the CDC’s HEADS UP concussion guidance, symptoms may appear immediately or develop hours or days after an injury.
The CDC’s concussion resources are available at https\://www\.cdc.gov/heads-up/.
Common Concussion Signs Referees Should Recognize
Officials should pay attention to a player’s behavior after contact, particularly when the athlete:
- Stumbles, falls, or struggles to maintain balance.
- Appears confused, dazed, or disoriented.
- Gets up unusually slowly after a collision.
- Shows poor coordination or abnormal movements.
- Appears unsure where to line up.
- Has difficulty responding to teammates or officials.
- Loses consciousness or displays seizure-like movements.
Players may also report headaches, dizziness, nausea, blurred vision, or sensitivity to light and noise.
A player does not need to display every symptom to require medical attention.
If an official observes signs of a possible concussion, the appropriate response is to follow the competition’s injury procedure and obtain medical evaluation—not to attempt a diagnosis.
When Is Emergency Medical Attention Necessary?
Some symptoms may indicate a more serious brain or neck injury.
Emergency warning signs include repeated vomiting, worsening headache, seizures, increasing confusion, unusual behavior, weakness, or difficulty waking.
If a player is unconscious or a serious neck injury is suspected, officials should summon emergency medical personnel and avoid unnecessary movement of the athlete.
Why Are Concussions a Serious Risk in Football?
Football combines high-speed running, repeated physical contact, and sudden changes in direction.
During a tackle, the head can experience rapid acceleration, deceleration, or rotational movement. These forces can affect the brain even when the initial impact occurs elsewhere on the body.
Different positions also experience different patterns of contact.
Quarterbacks may be vulnerable while throwing. Receivers can experience high-speed collisions while attempting catches. Running backs and linebackers regularly participate in tackles, while offensive and defensive linemen experience repeated contact throughout games and practices.
These differences matter because concussion prevention involves more than eliminating dramatic helmet-to-helmet collisions.
Repeated head impacts are also an area of medical concern.
Researchers have identified an association between repeated head impacts and chronic traumatic encephalopathy (CTE), a neurodegenerative disease identified in some people with histories of repetitive head impacts. However, scientists have not established an individual exposure threshold that reliably predicts who will develop CTE.
For referees, the practical objective is to reduce prohibited dangerous contact and respond promptly when a player may be injured.
What Does Research Say About Football Concussion Prevention?
Rule changes are frequently introduced to improve player safety, but their effectiveness should be evaluated using actual injury data.
Two studies of college football kickoffs provide useful evidence.
Ivy League Kickoff Rule Change: An 81% Lower Concussion Rate
In 2016, the Ivy League moved its kickoff line from the 35-yard line to the 40-yard line.
The objective was to increase touchbacks and reduce the number of high-speed kickoff returns.
A study published in JAMA in 2018 examined 68,479 plays across the 2013–2017 seasons.
Researchers compared kickoff concussion rates before and after the rule change.
| Measurement | Before (2013–2015) | After (2016–2017) |
|---|---|---|
| Kickoff plays | 2,379 | 1,467 |
| Kickoff concussions | 26 | 3 |
| Concussions per 1,000 kickoffs | 10.93 | 2.04 |
| Touchback percentage | 17.9% | 48.0% |
The observed concussion rate during kickoffs was approximately 81% lower following the change.
The findings suggest that modifying kickoff procedures may reduce certain high-risk collisions.
However, this was an observational study. It cannot establish that the rule change alone caused the reduction, and the results should not be generalized automatically to every football competition.
The study, Association of a Rule Change With Concussion Rates in Ivy League Football, was published in JAMA in 2018.
Another NCAA Study Found No Significant Reduction
A later study, published in 2023, examined the NCAA’s 2018 kickoff rule change using data from a Division I conference.
Researchers analyzed 108,774 plays between 2016 and 2021 and identified 242 concussions.
The kickoff-specific results differed from those of the Ivy League study.
| Measurement | Before rule change | After rule change |
|---|---|---|
| Kickoff plays | 2,630 | 4,328 |
| Kickoff concussions | 9 | 23 |
| Concussions per 1,000 kickoffs | 3.42 | 5.31 |
| Touchback percentage | 45% | 51% |
| Fair catch percentage | 1% | 7% |
Although touchbacks and fair catches increased, the researchers did not find a statistically significant reduction in kickoff concussions.
The observed concussion rate increased, but that difference was not statistically significant.
This is an important distinction.
The Ivy League and NCAA studies examined different rules, populations, and time periods. They should not be treated as interchangeable experiments.
The evidence supports evaluating each safety intervention individually rather than assuming that every rule change automatically reduces concussions.
The second study, Effect of the 2018 NCAA Kickoff Rule Change on Concussion Rates in Collegiate Football, is available through PubMed Central.
What Do NFL Concussion Statistics Show?
The NFL reported that concussions during preseason and regular-season practices and games declined by 17% in 2024 compared with 2023.
The league also reported that the 2024 total was 12% below the average for the 2021–2023 seasons.
These figures indicate an improvement in the league’s reported concussion numbers for that period.
However, the NFL’s broader safety program includes multiple interventions, such as equipment improvements, medical protocols, and playing-rule changes.
The data do not establish how much of the reduction, if any, resulted specifically from referee enforcement.
That distinction matters when interpreting football safety statistics.
Football Rules That Help Referees Prevent Dangerous Head Contact
Football officials enforce several rules intended to reduce unnecessary head and neck contact. Although the NFL, NCAA, and high school rulebooks share similar safety objectives, their terminology and penalties are not identical.
1. Targeting in College Football
NCAA targeting rules address certain forcible contact involving the crown of the helmet or the head and neck area of a defenseless opponent.
Officials consider factors such as the contact point, the player’s actions, and indicators of targeting.
These indicators can include launching toward an opponent, leading with the helmet, or making an upward thrust into an opponent.
A confirmed targeting foul carries a 15-yard penalty and disqualification, with additional consequences governed by the applicable season’s rules.
Replay review can help officials evaluate the contact.
However, not every helmet-to-helmet collision constitutes targeting. Officials must apply the actual rule definition rather than judge the play solely by how violent it looks.
2. NFL Helmet Contact and Defenseless Player Rules
The NFL uses its own rules concerning dangerous helmet contact.
The 2026 NFL Rulebook includes Rule 12, Section 2, Article 9, addressing prohibited contact against defenseless players, and Article 10, addressing impermissible use of the helmet.
These rules restrict specific dangerous actions rather than automatically penalizing every collision involving two helmets.
For example, prohibited forcible contact against a defenseless receiver may result in a personal foul.
Officials must evaluate whether the receiver qualifies as defenseless and whether the contact violates the relevant rule.
The NFL’s official 2026 rulebook provides the governing definitions and penalties.
3. Roughing the Passer
Quarterbacks may be vulnerable immediately after releasing a pass.
Roughing-the-passer rules restrict certain late hits and prohibited contact involving the quarterback’s head, neck, or lower body.
These rules do not prohibit all physical contact with quarterbacks. They establish boundaries between legal defensive play and unnecessary or dangerous contact.
The referee is particularly important in monitoring contact against the passer.
4. Blindside Blocks
A blindside block occurs when an opponent receives contact from a direction they may not reasonably anticipate.
Football rulebooks restrict certain forceful blindside blocks because they can create dangerous collisions.
Officials should pay particular attention to reverses, interception returns, and other plays where blockers may approach opponents unexpectedly.
The legality of a block depends on the specific competition’s rules, including the method and location of contact.
5. Kickoff Safety Rules
Kickoffs have received particular attention because they can involve players approaching one another at high speeds.
The NFL introduced its dynamic kickoff format in 2024, changing player alignment and movement before the return develops.
Officials enforce restrictions involving formations, player movement, and blocking.
The college studies discussed earlier show why these changes should be evaluated using actual injury outcomes rather than assumptions.
NFL vs. NCAA vs. High School: How Concussion Procedures Differ
Football officials must understand which rulebook applies to their competition.
The following table compares the principal differences.
| Safety issue | NFL | NCAA | High School / NFHS |
|---|---|---|---|
| Dangerous helmet contact | NFL-specific helmet restrictions | Targeting and helmet-contact rules | Illegal helmet contact and targeting provisions |
| Defenseless player protection | Explicit rules | Explicit rules | Applicable safety restrictions |
| Targeting replay | NFL uses its own review and disciplinary framework | Replay review for targeting | Generally no routine video review |
| Concussion evaluation | League medical protocol | Institutional concussion procedures | State association and healthcare requirements |
| Medical personnel | Team medical staff and independent consultants | School medical personnel and other designated professionals | Varies by school and competition |
| Return-to-play decision | Authorized medical professionals | Authorized medical professionals | Qualified healthcare professionals under applicable policies |
These differences make current rulebooks essential.
The NFHS football rules page provides access to high school football rule publications and updates, including 2026 rule changes.
High school officials should also review their state athletic association’s concussion policies, which may impose additional requirements.
What Should a Referee Do When a Concussion Is Suspected?
A referee’s response should be based on observable signs and the competition’s established injury procedures.
Step 1: Recognize the Warning Signs
Suppose a linebacker makes a tackle, stands up, and begins stumbling toward the sideline.
The official does not need to know whether the athlete has suffered a concussion.
The loss of balance is enough to raise a medical concern.
Step 2: Stop Play According to the Rules
The official should initiate the appropriate injury procedure and communicate with the rest of the crew.
If the ball is live, the stoppage must follow the governing rules.
If a player requires immediate medical attention, the next snap should not proceed before the situation has been addressed.
Step 3: Request Medical Assistance
The official should notify the appropriate medical personnel.
The referee should not conduct neurological examinations or attempt to determine whether the athlete is medically fit to continue.
Step 4: Communicate Objective Observations
A useful report might be:
“Number 32 stumbled after the tackle and appeared disoriented.”
This provides meaningful information without claiming a medical diagnosis.
Step 5: Follow the Return-to-Play Requirements
Medical personnel determine whether the player is eligible to return under the applicable protocol.
The official’s responsibility is to enforce the participation rules, not independently authorize medical clearance.
How Does the NFL Concussion Protocol Work?
The NFL uses a formal concussion evaluation process involving team medical personnel and independent medical professionals.
Its system includes unaffiliated neurotrauma consultants and certified athletic trainer spotters who help identify athletes requiring evaluation.
A player may be removed for assessment after displaying concerning signs.
If a concussion is diagnosed, the player cannot return to that game and must complete the league’s return-to-participation process before resuming competition.
Not every evaluation results in a concussion diagnosis. Return eligibility after an evaluation depends on the medical findings and applicable protocol.
The important distinction is that the referee identifies or communicates a concern, while medical personnel make the clinical determination.
What About Youth and High School Football?
Younger athletes may have difficulty recognizing or explaining concussion symptoms.
Some may also feel pressure to remain in the game.
High school and youth officials should therefore take observable warning signs seriously and understand the competition’s medical procedures.
The CDC’s HEADS UP guidance advises that an athlete with a suspected concussion should be removed immediately and kept out of sports participation on the day of injury until medically cleared.
The CDC also describes a graduated six-step return-to-sports progression under healthcare supervision, with each step generally taking at least 24 hours.
Officials should not allow competitive pressure, a close score, or a coach’s request to override applicable injury rules.
Can Football Helmets Prevent Concussions?
Football helmets are important protective equipment, but they cannot eliminate concussion risk.
Helmets help reduce certain impact forces and protect against injuries such as skull fractures.
However, the brain can still experience rapid acceleration and rotational forces during a collision.
Proper fit and maintenance remain important.
Mouthguards primarily protect teeth and surrounding oral structures. Evidence regarding their effectiveness in preventing concussions is less certain, so they should not be treated as a substitute for other safety measures.
Referees should enforce equipment rules, while coaches and equipment personnel remain responsible for proper fitting and maintenance.
Three Situations Every Football Referee Should Understand
Scenario 1: A Legal Tackle Causes a Possible Injury
A quarterback is tackled legally and strikes his head against the ground.
No flag is thrown, but the player stands up and loses balance.
The official initiates the injury procedure and alerts medical personnel.
Lesson: A legal tackle can still cause a concussion.
Scenario 2: A Receiver Takes a Prohibited Hit
A receiver attempts to catch a pass and experiences prohibited forcible contact to the head or neck area while defenseless.
The official throws a flag.
The receiver remains on the ground and appears confused.
The crew handles both the penalty and the injury response.
Lesson: A penalty decision and a medical evaluation are separate responsibilities.
Scenario 3: A Player Wants to Continue Despite Warning Signs
A linebacker gets up slowly after a collision and appears disoriented.
He tells the official that he feels fine and attempts to line up for the next play.
The official follows the applicable injury procedure.
Lesson: A player’s willingness to continue does not replace medical evaluation.
Best Practices for Football Referees
Officials can improve player safety by preparing before games and communicating clearly during them.
Before kickoff, the crew should review the relevant injury procedures, identify how medical personnel can be contacted, and confirm responsibilities for monitoring dangerous contact.
During the game, officials should:
- Enforce prohibited helmet contact and defenseless-player rules consistently.
- Watch for unusual behavior following legal and illegal collisions.
- Communicate promptly when a possible injury is observed.
- Avoid making medical diagnoses.
- Follow the applicable injury and participation procedures.
- Document incidents when required by the league.
Officials should also understand that a player can be injured without any foul occurring.
The objective is not to penalize every hard hit. It is to enforce the rules accurately while recognizing situations that require medical attention.
Frequently Asked Questions
Can a referee remove a player for a suspected concussion?
Officials can initiate the appropriate injury procedures when a player shows concerning signs. The exact removal and stoppage process depends on the competition’s rules.
Does every helmet-to-helmet hit cause a concussion?
No. Concussions can occur with or without helmet-to-helmet contact. Whether a particular hit is illegal also depends on the governing rulebook.
Can a player suffer a concussion after a legal tackle?
Yes. A legal tackle can produce forces sufficient to cause a concussion. A penalty is not required for an injury to occur.
Do targeting penalties reduce concussions?
Targeting rules are intended to restrict dangerous contact. However, the effectiveness of individual rules must be evaluated using appropriate injury data. Research on football safety rule changes has produced varying results.
Can a player return to the same game after a concussion?
A player diagnosed with a concussion must follow the applicable medical protocol. For youth and school sports, CDC guidance recommends no same-day return after a suspected concussion.
Who decides whether an injured player can return?
Authorized healthcare professionals make medical clearance decisions under the applicable concussion protocol. Referees do not independently diagnose concussions or provide medical clearance.
Are football helmets enough to prevent concussions?
No. Helmets provide important protection but cannot eliminate concussion risk.
Conclusion
Referees cannot prevent every concussion in football, but they play an important role in reducing avoidable risks.
Their responsibilities include enforcing rules against dangerous contact, recognizing observable signs of possible injury, initiating appropriate stoppages, and helping medical personnel reach injured athletes.
Published research suggests that some football safety rule changes have been associated with lower concussion rates, while others have produced mixed results.
The evidence supports a comprehensive approach combining rule enforcement, medical protocols, equipment standards, safer playing techniques, and continued injury monitoring.
Ultimately, a referee’s most important safety decision is sometimes not whether to throw a flag, but whether a player needs medical attention before taking another snap.