If you or a family member just experienced a hit to the head or body, it can be hard to know what is normal and what is dangerous. This guide explains the most common concussion symptoms, which red flags require urgent medical care, what to do in the first 48 hours, and how recovery is usually managed in North America. Concussion is a functional brain injury, structural scans like CT or MRI are often normal, so diagnosis depends on symptoms, examination, and standardized tools [1,2].
What concussion symptoms really mean
A concussion is a rapid, short-lived disturbance of brain function that follows an impact to the head or body. The problem is typically functional rather than structural, which explains why imaging is often normal and why clinicians rely on history, symptom checklists, cognitive screening, balance and oculomotor exams, and targeted physical examination [1,2].
15 early concussion symptoms you should not ignore
If any of the following appear after a hit, assume concussion until proven otherwise and follow the plan below.
- Headache or head pressure
- Dizziness or vertigo
- Nausea or vomiting
- Balance problems or unsteadiness
- Light sensitivity
- Noise sensitivity
- Neck pain or stiffness, often related to whiplash mechanisms
- Blurred or double vision, difficulty focusing on text
- Feeling slowed down, mental or physical
- Brain fog or confusion
- Memory problems, especially around the event
- Trouble concentrating, tasks drain energy quickly
- Fatigue or unusual drowsiness
- Irritability, anxiety, or low mood
- Sleep changes, difficulty falling or staying asleep, or sleeping much more than usual
Symptoms can evolve over 24 to 48 hours. When in doubt, treat as concussion and seek appropriate assessment. The symptom profile above reflects international consensus and public health guidance [1,8].
Red flags, when to seek urgent medical care
Call emergency services or go to the emergency department immediately if any of the following occur after a suspected concussion: progressively worsening or severe headache, repeated vomiting, seizure, one pupil larger than the other, slurred speech, weakness, numbness, severe neck pain, increasing confusion, agitation, or inability to wake, loss of consciousness that lasts more than a brief moment. These may indicate a more serious injury and require urgent evaluation [1].
Your first 48 hours, exactly what to do
Relative rest for 24 to 48 hours
Cut back, do not shut down. Avoid risky activity, keep light daily tasks if they do not worsen symptoms more than mildly.
Light, symptom limited activity
Short walks or gentle stationary cycling are reasonable if symptoms remain mild and settle within about an hour after stopping. Early, sub symptom aerobic exercise started after a brief rest period is associated with faster recovery in adolescents compared with stretching or prolonged rest [4,5].
Screen hygiene
Reduce brightness, take regular breaks, enlarge fonts, use dark mode if helpful.
Sleep routine
Consistent bedtime and wake time, cool and dark room, limit daytime naps to less than 30 minutes.
Hydration and nutrition
Regular meals and water. Avoid alcohol completely during early recovery.
Pain control
Acetaminophen in the first 24 hours if needed. Avoid nonsteroidal anti inflammatory drugs on day 1 unless advised by a clinician.
No driving
Do not drive if you are dizzy, foggy, or slowed.
Monitor red flags
Seek emergency care if any red flags develop [1,3].
Why not strict rest
Prolonged cocooning beyond the first 24 to 48 hours can worsen symptoms and delay recovery. A randomized trial of strict rest found worse symptom scores and delayed recovery compared with usual care [3]. Early sub threshold aerobic exercise has shown faster recovery and lower risk of prolonged symptoms in adolescents [4,5].
How clinicians assess concussion symptoms
In clinic or on the sideline, clinicians use standardized tools to structure the evaluation:
SCAT6 and Child SCAT6
Symptom checklist, cognitive tests, and balance screening. These are screening tools that support, not replace, clinical diagnosis [2].
Symptom scales and serial tracking
For example, the Post Concussion Symptom Scale can quantify symptom burden over time.
Targeted physical examination
Vestibular and oculomotor function, cervical spine range and tenderness, balance and exertional tolerance. Imaging is typically normal in concussion and is reserved for red flags or concern for structural injury [1].
Evidence based recovery roadmap
1) Early, sub symptom aerobic exercise
Starting within the first 7 to 10 days, guided, symptom limited aerobic exercise such as brisk walking or stationary cycling tends to shorten recovery and reduce the risk of persistent symptoms in adolescents, compared with stretching or usual care [4,5]. A common starting dose is about 20 minutes at a heart rate that does not meaningfully worsen symptoms, then progress as tolerated.
2) Cervical, vestibular, and oculomotor rehabilitation
If dizziness, neck pain, blurred vision, or motion sensitivity persist, targeted cervicovestibular therapy can speed recovery compared with control [6]. Many patients benefit from gaze stabilization, balance training, and neck mobility and strengthening delivered by trained clinicians. Evidence for oculomotor interventions is growing, results are mixed, targeted programs are reasonable when deficits are identified [7].
3) Return to learn and daily life
After a short rest of 24 to 48 hours, begin a graded return to school or work with symptom limited attendance and coursework. Use accommodations such as reduced workload, breaks, extra time, printed notes, and adjusted lighting. Current consensus favors early reintegration rather than prolonged isolation, with step ups guided by symptoms [1,8].
4) Sleep, mood, and pacing
Prioritize sleep hygiene, brief daytime rest periods, and pacing, which alternates cognitive or physical tasks with short breaks. Address anxiety or mood symptoms early, these can amplify the concussion experience and slow recovery [1].
Return to play or work, how progression happens
Most people follow a stepwise progression, moving to the next step only if symptoms remain mild and brief, generally resolving within about an hour after activity. An example progression is shown below.
- Light aerobic activity, walking or light cycling
- Moderate aerobic activity, increase heart rate without risk
- Sport or work specific drills, non contact or low risk
- Non contact practice or higher intensity work simulation
- Full practice or near full workload
- Full game or full duties
For non athletes, substitute job specific tasks such as screen time, meetings, or lifting. If symptoms spike more than mildly or persist, step back and retry after 24 hours. Consensus guidance supports this active, symptoms guided approach [1].
How long recovery takes, and when to refer
Many healthy teens and adults recover in about 2 to 4 weeks. Some take longer, especially with high initial symptom burden, vestibular or ocular findings, migraine history, pre existing mental health conditions, or delayed presentation. In these cases, early referral to a concussion trained rehabilitation clinician is recommended [1,6,8].
Frequently asked questions
What are the most common early concussion symptoms
Headache, dizziness, nausea, light or noise sensitivity, brain fog, fatigue, sleep changes, and trouble concentrating are common. Watch for red flags such as worsening headache, repeated vomiting, seizure, unequal pupils, or severe confusion. These require urgent care [1].
How soon can I exercise after a concussion
After 24 to 48 hours of relative rest, light, sub symptom aerobic exercise is usually appropriate and may speed recovery when progressed sensibly. If symptoms spike more than mildly or do not settle within an hour afterward, scale back and retry later. Consult a clinician if you are unsure [4,5].
Will a scan show my concussion
Usually no. CT and MRI are often normal in concussion. Imaging is used when red flags suggest more serious injury [1].
How do clinicians decide when I am ready for school, work, or sport
Clinicians track symptoms and function using standardized tools such as the SCAT6 or Child SCAT6 and progress activity stepwise as tolerated [1,2].
What to do next
If you want a clear plan with expert guidance, take one of these next steps.
Need hands-on care
Find a Certified Concussion Clinic to book with a trained provider in your area.
Want a guided recovery framework
Free 90 minute Patient Workshop shows how to reduce symptoms, pace activity, and know when to seek targeted rehab.
References
- Patricios J, Schneider KJ, Dvorak J, et al. Consensus statement on concussion in sport, the 6th International Conference on Concussion in Sport, Amsterdam, October 2022. Br J Sports Med. 2023,57,695-711. Available from: https://bjsm.bmj.com/content/57/11/695
- Echemendia RJ, Brett BL, Broglio SP, et al. The Sport Concussion Assessment Tool 6, background and rationale. Br J Sports Med. 2023,57,619-621. Available from: https://bjsm.bmj.com/content/57/11/619
- Thomas DG, Apps JN, Hoffmann RG, McCrea M, Hammeke T. Benefits of strict rest after acute concussion, a randomized controlled trial. Pediatrics. 2015,135,213-223. Available from: https://publications.aap.org/pediatrics/article/135/2/213/33004
- Leddy JJ, Haider MN, Ellis MJ, et al. Early subthreshold aerobic exercise for sport related concussion, a randomized clinical trial. JAMA Pediatr. 2019,173,319-325. Available from: https://jamanetwork.com/journals/jamapediatrics/article-abstract/2716816
- Leddy JJ, Master CL, Mannix R, et al. Early targeted heart rate aerobic exercise versus placebo stretching for sport related concussion in adolescents, a randomized controlled trial. Lancet Child Adolesc Health. 2021,5,792-799. Available from: https://www.thelancet.com/journals/lanchi/article/PIIS2352-4642(21)00275-8/fulltext
- Schneider KJ, Meeuwisse WH, Nettel-Aguirre A, et al. Cervicovestibular rehabilitation in sport related concussion, a randomized controlled trial. Br J Sports Med. 2014,48,1294-1298. Available from: https://bjsm.bmj.com/content/48/17/1294
- Kontos AP, Deitrick JM, Collins MW, Mucha A. Review of vestibular and oculomotor screening and concussion rehabilitation. J Athl Train. 2017,52,256-261. Available from: https://meridian.allenpress.com/jat/article/52/3/256/112700
- Davis GA, Anderson V, Babl FE, et al. What is the difference in concussion management in children as compared with adults, a systematic review. Br J Sports Med. 2017,51,949-957. Available from: https://bjsm.bmj.com/content/51/12/949