The NFL Concussion Protocol Explained

By 4Football Staff · October 19, 2026 · 10 min read

Who watches for head injuries on game day, what happens when a player is removed, how a return to play is staged, and how the NFL's approach compares with youth and high school rules.

A player takes a hard hit, stays down for a moment and then walks to the sideline. A minute later the broadcast shows him heading toward a medical tent or the locker room, and the announcers say he is "in the concussion protocol." For many viewers the phrase is a black box. Is it a test? A rule? A diagnosis? Who decides, and what happens next?

The protocol is a written league policy that sets out who must evaluate a player after a possible head injury, what findings keep him out of a game, and the steps he must complete before he returns to practice or play. It has been revised more than once as medical understanding has developed, and it is negotiated by the league and the players' union rather than imposed by one side alone.

A note before we begin. This article is general education about how a league policy works. It is not medical advice, and it cannot tell you whether a particular person has a concussion or is ready to play. Anyone with a suspected head injury should be seen by a doctor or other qualified health professional, and decisions about returning to sports belong to those professionals and the rules of the league or school involved.

What a concussion is, in brief

A concussion is a brain injury caused by a blow to the head or body, or by a violent shaking of the head, that temporarily changes how the brain works. Symptoms can include headache, dizziness, confusion, trouble with balance, sensitivity to light or noise, nausea or memory problems. They do not always show up right away, and a person does not need to lose consciousness to have one. Because the signs can be subtle and a player may have reasons to downplay them, leagues rely on trained observers rather than on the player's own report alone.

Why the protocol exists

Football involves repeated contact, and head injuries are a recognized risk. Over the years, the league has faced questions about how it identifies and manages them, and about the long-term health of former players. In response, it has built a system whose purpose is to make sure that a player with a suspected head injury is examined by qualified people, is kept out of play when warranted and returns only through a staged process.

The protocol is also meant to remove pressure from the player and the coaching staff. A competitive athlete may want to stay in the game, and a coach may want his best players available. By assigning decisions to medical personnel who are independent of the coaching staff, the system tries to keep those incentives from shaping the outcome.

The people involved on game day

Several roles watch for head injuries, and the redundancy is intentional.

• Team physicians and athletic trainers. Each club's medical staff is on the sideline and is responsible for evaluating players.
• Unaffiliated neurotrauma consultants. These are neurologists or neurosurgeons who are appointed independently of the teams and attend games. Their role is to take part in the evaluation and to help decide whether a player may return. They are described as "unaffiliated" because they do not work for either club.
• Booth spotters. Certified athletic trainers sit in a booth above the field with video access and watch for signs of injury that those on the sideline may miss, such as a player stumbling or reacting oddly after contact. A spotter can communicate with the sideline and, under the protocol, can ask for a medical timeout so that a player can be evaluated.
• The league's medical and football operations staff, who oversee the policy, review incidents afterward and can follow up when the protocol was not followed.

The system is designed so that no one person has the final say. A coach does not decide, and the player's wish to continue does not decide either.

What happens when a player is removed

When a possible head injury is identified, the sequence generally runs like this.

1. Identification. A sideline staff member, a spotter or an official notices a sign of a possible injury, or the player reports symptoms.
2. Removal from play. The player leaves the field and is taken for evaluation. A player who shows certain obvious signs, such as loss of consciousness or problems with balance and coordination severe enough to be described as gross motor instability, must be removed and cannot return to that game. The league has tightened this list over time, so the exact wording should be checked in the current policy.
3. Sideline evaluation. The team physician and the unaffiliated consultant examine him. The exam typically includes questions about symptoms, tests of memory and concentration, and checks of balance and eye movement. Staff can compare the results with the player's baseline, a set of results recorded before the season when he was healthy.
4. Locker-room evaluation, if needed. Depending on the findings, the player may be taken to a quieter space for a fuller exam, and the clinicians may review video of the play.
5. Decision. If a concussion is diagnosed, the player is out for the remainder of the game. If the exam is clear and the findings meet the policy's conditions, he may return, but only with the agreement of the people who examined him.

Not every examination ends in a diagnosis. Sometimes a player is evaluated and cleared. The point is that anyone who might have a concussion is examined by qualified people before going back in.

Why baselines matter

Before a season, players complete baseline testing. The tests measure things such as memory, reaction time, concentration and balance while the player is healthy. After a possible injury, clinicians compare the new results with that player's own baseline rather than with a population average, because people differ so much in how they perform on such tests. A baseline is a reference point, not a verdict, and a result that matches it does not rule out an injury on its own. Doctors combine it with symptoms, a physical exam and what they saw on video.

What the player is asked to do

The protocol relies on honesty from the player, and the policy encourages players to speak up about their own symptoms and about teammates who seem unwell. That cultural piece is hard to write into a rule, but it is a large part of whether any protocol works in practice. A player who knows that reporting a symptom will be met with care, not suspicion, is more likely to report it.

The return-to-participation steps

A diagnosed concussion does not end with a single clearance. The player moves through a staged return that gradually increases physical demands. The protocol describes five stages. The general outline is this:

The player advances only if he remains free of symptoms at each stage. If symptoms return, he steps back. At the end of the process, both the club's physician and the independent neurotrauma consultant must agree that he is ready. Only then can he return to games.

The time it takes varies a great deal from person to person. Some players move through the stages quickly, and others need much longer. No fixed number of days applies to everyone, and the policy is built around symptoms and clinical findings rather than the calendar.

The injury report will often list a player's status during this process, with designations that reflect whether he is expected to be available. It does not usually say which stage of the protocol he is in, so avoid reading too much into a designation.

How the policy has changed

The league's approach has been revised repeatedly since it first adopted a written policy in the late 2000s. Typical themes in the revisions include:

• Stronger requirements about who must examine a player and when.
• The addition of independent consultants and booth spotters.
• Broader lists of signs that require a player to leave the game.
• More authority for spotters to stop play for an evaluation.
• Enforcement tools, including the possibility of discipline when a club fails to follow the protocol.

These changes usually follow a high-profile incident or a review of the existing practice, and they are developed jointly by the league and the players' association. If you read a news story about "changes to the protocol," it is worth looking at what specifically changed, because small wording differences can affect who has authority in a given situation.

Equipment and rules that support the protocol

The protocol is not the only part of the league's approach to head safety. Rules and equipment also matter.

• Rules that penalize dangerous contact. Several rules aim to reduce head-related injuries, including those that protect players in vulnerable positions. See Defenseless Player Protections for how those work.
• Changes to the game. Over many years, the sport has adopted a long list of safety rules, a history covered in A Century of Safety Rules in Football.
• Helmets. The league and the union have tested helmets and publish performance information on models, and players are encouraged to wear helmets that perform well in testing. No helmet makes a player concussion-proof, and manufacturers cannot promise otherwise.
• Practice limits. The collective bargaining agreement limits contact in practices, which reduces the number of hits players take over a season.

How it compares with other levels

The NFL has more medical resources than any other level of football, including independent consultants and booth spotters, so its protocol cannot be copied exactly at the youth or high school level. The principles carry over, though.

• State laws. Every state in the country has a law about youth concussions in sports. Although the details vary, the common pattern is that a young athlete suspected of a concussion must be removed from play and cannot return until cleared in writing by a qualified health professional. Check your own state's law and your school or league's policy.
• Athletic trainers. Many high schools employ or contract with athletic trainers, who are often the first to evaluate an injured player. Our piece on athletic trainers in high schools explains their role.
• College football. The NCAA and its conferences have their own concussion management requirements, which colleges must follow. The structure resembles the NFL's in outline but is administered differently.
• Youth and recreational play. Programs that teach tackling and play flag or other limited-contact forms can reduce exposure. The Play section of 4Football is a good starting point for recreational options.

If you coach or parent a young athlete, the rule is simple: when in doubt, sit the player out and get an evaluation. The next game is never more important than a person's health.

Common misunderstandings

"If he did not lose consciousness, it was not a concussion." Most concussions occur without loss of consciousness.

"A clear sideline test means no concussion." Sideline tests are screening tools. Symptoms can appear later, and clinicians may reevaluate.

"The coach decides if a player returns." Under the NFL protocol, medical personnel decide, and the independent consultant has a role that the coaching staff does not.

"The protocol is the same everywhere." It is specific to the NFL. Colleges, high schools and youth leagues follow their own rules and state laws.

"A helmet prevents concussions." Helmets reduce some injuries, particularly skull injuries, but no helmet prevents concussions entirely.

"Return to play is a single decision." It is a staged process that begins after the player is symptom-free and ends only with agreement among the doctors involved.

What fans and players can do

If you follow the NFL, you will see more clearly what is happening if you know the terms. When a player is "in the protocol," it means he is being evaluated or is moving through the return steps. The designation is not a judgment about how serious the injury is, and it says nothing about how long he will be out. If you manage a fantasy team, watch the injury report and the team's own announcements, and remember that a status can change quickly in either direction.

If you play the game, learn to report symptoms. A teammate who says he feels "off" deserves to be taken seriously, and a player who hides symptoms puts himself at risk.

The short version

• The NFL concussion protocol is a written league policy, developed with the players' association, that governs how head injuries are identified, evaluated and managed.
• Team doctors and trainers, independent neurotrauma consultants and booth spotters all play a part, and coaches do not decide.
• Certain signs, such as gross motor instability, require removal from the game, and the list has been tightened over the years.
• Return to play follows five stages and ends only when both the club's physician and the independent consultant agree.
• Time away varies by individual; there is no one-size-fits-all number of days.
• Youth and high school football fall under state laws and school or league policies, which generally require removal from play and written clearance.
• Anyone with a suspected head injury should see a doctor or other qualified health professional.