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Sports Concussion: Symptoms and Return-to-Play Protocol

A sports concussion causes headache, brain fog, balance problems, and light or noise sensitivity. Athletes must not return to play the same day and need a clinician-supervised graduated return-to-sport protocol. Worsening headache, repeated vomiting, or one pupil larger than the other requires emergency evaluation.

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What is a sports concussion?

A concussion is a traumatic brain injury caused by a biomechanical force transmitted to the brain — either from a direct blow to the head or an indirect impact (such as a body check that causes the head to snap) that creates an acceleration-deceleration force 12.

Concussions do not usually cause structural damage visible on CT or MRI. The injury is functional: a disruption of neuronal activity from the mechanical force triggers a cascade of neurochemical changes that temporarily impair brain function. This is why a normal CT scan does not rule out a concussion.

Concussions occur across all contact and collision sports — football, ice hockey, soccer, rugby, lacrosse, wrestling, basketball — and in recreational activities. They also occur without loss of consciousness; most athletes with concussions do not lose consciousness.

What are the symptoms of a concussion?

Concussion symptoms span several domains 123:

Physical: - Headache (the most common symptom) - Dizziness or balance problems - Nausea or vomiting (brief vomiting right after impact; repeated vomiting is a red flag — see below) - Sensitivity to light (photophobia) or noise (phonophobia) - Visual disturbances — blurred or double vision - Feeling slowed down or "in a fog"

Cognitive: - Difficulty concentrating or remembering - Feeling mentally foggy - Slowed processing speed - Memory gaps around the injury (retrograde or anterograde amnesia)

Emotional/behavioral: - Irritability or mood changes - Anxiety - Emotional lability (crying more easily)

Sleep: - Sleeping more or less than usual - Difficulty falling asleep - Fatigue

Symptoms may not appear immediately — some develop hours after the injury event.

What is the graduated return-to-sport protocol?

Medical consensus is clear: an athlete should not return to sport on the same day as a concussion, and return must follow a structured, stepwise protocol 12. The standard six-step graduated return-to-sport (GRTS) protocol, originating from the Berlin Consensus Statement, is widely adopted by sports medicine organizations 2:

| Step | Activity | Goal | |---|---|---| | 1 | Complete rest until symptom-free | Recovery | | 2 | Light aerobic activity (walking, stationary cycling) | Increased heart rate | | 3 | Sport-specific exercise (running drills, skating) | Movement patterns | | 4 | Non-contact training drills | Exercise, coordination, cognition | | 5 | Full-contact practice (after medical clearance) | Restore confidence, assess function | | 6 | Return to competition | |

Key rules: - Each step takes a minimum of 24 hours - If symptoms return at any step, the athlete drops back one level and waits until symptom-free again before attempting to progress - Medical clearance from a qualified clinician is required before Step 5 (full-contact practice) - The minimum total time from Step 1 to full return is five days if everything goes smoothly — but most athletes take longer

For younger athletes (under 18), protocols are generally more conservative, with longer rest periods and more gradual progression.

Who can clear an athlete to return to sport?

Medical clearance for full-contact return (Step 5) should come from a clinician trained in concussion evaluation — typically a sports medicine physician, a team physician, or a neurologist with sports concussion expertise 1.

Clearance involves confirming: - Complete symptom resolution - Normal neurological examination - Satisfactory performance on balance and cognitive assessment - Normal or back-to-baseline performance on neurocognitive testing (ImPACT or similar tools) if baseline was established

Athletic trainers and physical therapists who are trained in concussion protocols often manage the day-to-day monitoring and step progression, escalating to the physician for final clearance.

How long does concussion recovery take?

For most adult athletes, concussion symptoms resolve within 7–14 days. For adolescents, recovery typically takes longer — often two to four weeks.

Prolonged concussion (symptoms lasting more than four weeks in adults) occurs in a minority of athletes and is more likely when: - There is a prior history of concussions - Sleep disruption is prominent early in recovery - Migraine history is present - The athlete returned to play too soon after a prior concussion

Early light aerobic activity — at a level that does not provoke symptoms — is now recommended as part of recovery rather than strict total rest. Complete physical and cognitive rest beyond the first day or two is no longer the standard approach.

What is second-impact syndrome?

Second-impact syndrome refers to the rare but catastrophic outcome when an athlete sustains a second concussion before fully recovering from the first. The brain's impaired autoregulation during the recovery window makes it significantly more vulnerable to a second force. This is the primary reason that same-day return-to-play is prohibited and the GRTS protocol is strictly graduated.

The risk is most clearly established in adolescents and young athletes, which is one reason youth return-to-sport protocols are more conservative than adult protocols.

Who manages sports concussion care?

  • Sports medicine physician or team physician — initial evaluation, ongoing monitoring, final return-to-sport clearance
  • Neurologist — prolonged or complicated concussion, seizure history, concern for structural injury
  • Athletic trainer — on-field recognition, protocol monitoring
  • Physical therapist — vestibular and cervical rehabilitation when dizziness, neck pain, or balance problems are prominent

Cloudia is not the right provider for sports concussion management, which requires hands-on neurological evaluation. Gale can help with primary care follow-up, academic or work accommodations, and coordination with the sports medicine team.

Common questions

Do you have to lose consciousness to have a concussion?

No. Loss of consciousness occurs in a minority of concussions. Most athletes with concussions remain conscious throughout. Brief confusion, disorientation, amnesia, or any of the symptom clusters described above are sufficient for a clinical concussion diagnosis.

Can a normal CT scan mean there is no concussion?

Yes — this is expected. CT scans visualize structural damage (bleeding, fracture) but not the functional disruption that causes concussion symptoms. A normal CT does not rule out a concussion. CT is used to rule out serious structural complications, not to diagnose concussion.

When can a child return to school after a concussion?

Most children can return to school before they are ready to return to sport, often within a few days with temporary academic accommodations — reduced workload, breaks, dimmed screens, extended test time. A return-to-learn protocol runs in parallel with the return-to-sport protocol. Your child's school and the treating clinician can coordinate this.

What should I do immediately if an athlete has a concussion on the field?

Remove the athlete from play immediately. Do not allow same-day return regardless of how mild the impact appears. If any red-flag symptoms are present (see below), call for emergency services. Otherwise, arrange evaluation by a trained clinician within 24 hours.

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Call 911 immediately for these signs after a head injury

  • —One pupil larger than the other, or unequal pupil reactivity
  • —Repeated or forceful vomiting (beyond a single episode immediately after impact)
  • —Seizure or convulsive activity
  • —Worsening headache that intensifies over time rather than improving
  • —Weakness, numbness, or clumsiness in the arms or legs
  • —Slurred speech or inability to recognize people or places
  • —Loss of consciousness lasting more than 30 seconds
  • —Athlete who cannot be awakened or who is increasingly drowsy

Call 911 or take the athlete directly to an emergency department for any of the above signs. These may indicate intracranial bleeding or a structural brain injury requiring urgent evaluation.

This article provides general health education and does not constitute medical advice, diagnosis, or a treatment recommendation. Consult a licensed clinician for evaluation of your specific condition.

References

  1. 1.Harmon KG, Clugston JR, Dec K, Hainline B, Herring SA, Kane SF, Kontos AP, Leddy JJ, McCrea MA, Poddar SK, Putukian M, Wilson JC, Roberts WO (2019). American Medical Society for Sports Medicine position statement on concussion in sport. British Journal of Sports Medicine. doi:10.1136/bjsports-2018-100338 ✓Concussion definition, symptom domains, graduated return-to-sport protocol, medical clearance requirements, same-day return prohibition
  2. 2.McCrory P, Meeuwisse W, Dvorak J, et al. (2017). Consensus statement on concussion in sport-the 5th international conference on concussion in sport held in Berlin, October 2016. British Journal of Sports Medicine. doi:10.1136/bjsports-2017-097699 ✓Six-step graduated return-to-sport protocol; conservative approach for youth athletes; second-impact syndrome context; early light aerobic activity in recovery
  3. 3.Centers for Disease Control and Prevention (2025). Signs and Symptoms of Concussion. CDC HEADS UP Program. link ✓Concussion symptom recognition for athletes and parents; physical, cognitive, emotional, and sleep symptom domains

3 sources, numbered by first appearance. General health information, not medical advice — synthetic demonstration content.