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Mild Traumatic Brain Injury (Concussion) – A Patient‑Focused Guide

Overview

A mild traumatic brain injury (mTBI), commonly called a concussion, is a temporary disturbance of brain function caused by a bump, blow, or jolt to the head or body. Unlike severe brain injuries, a concussion typically does not show up on standard imaging (CT or MRI) and most people recover fully with proper care.

• Who it affects: Anyone can sustain a concussion, but athletes, military personnel, children, and older adults are at higher risk.
• Prevalence: According to the Centers for Disease Control and Prevention (CDC), an estimated 1.6–3.8 million sports‑related concussions occur in the United States each year, and approximately 10 million total TBIs (including mild) present annually to emergency departments.<sup>[1]</sup>
• Typical course: Most people feel better within days to weeks, but 10‑30% experience persistent symptoms lasting months—known as post‑concussion syndrome.<sup>[2]</sup>

Symptoms

Symptoms can be subtle and may appear immediately or develop over several hours. They fall into four categories: physical, cognitive, emotional, and sleep‑related.

Physical

• Headache – often described as pressure‑like or throbbing.
• Dizziness or balance problems – feeling unsteady or “spinning.”
• Nausea / vomiting.
• Blurred or double vision.
• Noise or light sensitivity (photophobia, phonophobia).
• Ringing in the ears (tinnitus).

Cognitive

• Confusion or feeling “in a fog.”
• Memory trouble – difficulty recalling events before or after the injury.
• Slowed thinking – trouble concentrating, planning, or making decisions.

Emotional / Mood

• Irritability or mood swings.
• Sadness or anxiety.
• Feeling unusually emotional or tearful.

Sleep

• Fatigue or feeling unusually drowsy.
• Difficulty falling or staying asleep.
• Sleeping more than usual.

Symptoms in children can manifest as clinginess, persistent crying, changes in eating or sleeping patterns, or a loss of interest in play.

Causes and Risk Factors

Typical Causes

• Sports injuries – contact sports (football, soccer, hockey) and even non‑contact activities (gymnastics, baseball).
• Falls – especially among children under 5 and adults over 65.
• Motor vehicle collisions – rapid deceleration or head impact.
• Physical assaults – punches, kicks, or being shaken violently.
• Blast exposure – military personnel exposed to explosions.

Risk Factors

• Previous concussion – each concussion increases susceptibility to future injuries.
• Sex – females often report more severe and prolonged symptoms.<sup>[3]</sup>
• Age – children’s brains are still developing; older adults have more fragile cerebral tissue.
• Playing without protective equipment (e.g., helmets or mouthguards).
• High‑impact activities performed without proper conditioning.
• Substance use – alcohol or drugs can mask symptoms and increase injury severity.

Diagnosis

Diagnosing a concussion relies on a detailed history, focused physical examination, and, when indicated, neuro‑imaging to rule out more serious injury.

Clinical Evaluation

• History: mechanism of injury, immediate symptoms, loss of consciousness (if any), and prior concussions.
• Neurological exam: assessment of cranial nerves, balance, coordination, pupil reaction, and reflexes.
• Cognitive screening tools:
  • SCAT‑5 (Sport Concussion Assessment Tool, 5th edition)
  • King‑Devick test (rapid eye‑movement reading)
  • Mini‑Mental State Examination (MMSE) – for older adults

Imaging

Standard CT or MRI is **not required** for most mild concussions but is ordered if:

• There is a history of loss of consciousness >30 minutes.
• Neurological deficits (weakness, numbness, slurred speech).
• Worsening headache or vomiting.
• Age >60 or anticoagulant use.

CT excels at detecting acute bleeding; MRI is more sensitive for diffuse axonal injury, which is rare in mild cases.

Other Tests (when indicated)

• Balance assessments: Balance Error Scoring System (BESS).
• Oculomotor testing: vestibular‑ocular reflex, smooth pursuit.
• Blood biomarkers (research stage): glial fibrillary acidic protein (GFAP) and ubiquitin carboxy‑terminal hydrolase‑L1 (UCH‑L1).

Treatment Options

Initial Management

• Physical & mental rest: at least 24–48 hours of reduced cognitive load (no school, work, video games, or intense reading).
• Gradual return to activity: follow a stepwise protocol (often called “Return‑to‑Play” or “Return‑to‑Learn”). Each step lasts 24 hours; symptoms must be absent before progressing.<sup>[4]</sup>

Medications

• Pain relief: acetaminophen preferred; avoid NSAIDs (ibuprofen, aspirin) for the first 24 hours if intracranial bleeding is a concern.
• Anti‑nausea: ondansetron if vomiting persists.
• Sleep aids: short‑term melatonin can be helpful; prescription sedatives are generally avoided.
• Depression / anxiety: SSRIs may be prescribed if mood symptoms are prolonged, under psychiatrist guidance.

Therapies

• Physical therapy: vestibular rehabilitation for dizziness and balance problems.
• Occupational therapy: strategies to manage cognitive fatigue (task chunking, pacing).
• Neuro‑cognitive therapy: targeted exercises for attention, memory, and processing speed, often supervised by a neuropsychologist.

When Procedures Are Needed

Procedures are rare for mild concussion but may be required if complications develop (e.g., subdural hematoma). In such cases, neurosurgical intervention (burr‑hole drainage or craniotomy) would be performed.

Living with Mild Traumatic Brain Injury (Concussion)

Daily Management Tips

• Plan for rest periods: schedule short breaks every 30–45 minutes during mentally demanding tasks.
• Hydration & nutrition: drink plenty of water; prioritize antioxidant‑rich foods (berries, leafy greens) to support brain recovery.
• Avoid screens: limit TV, smartphones, and computers for the first 24–48 hours; use larger fonts and dim lighting if needed.
• Sleep hygiene: maintain a regular bedtime, keep the room dark and cool, and avoid caffeine after noon.
• Gradual exercise: start with light walking; avoid contact sports or heavy lifting until cleared.
• Monitor symptoms: keep a symptom diary noting intensity, triggers, and improvement.
• Return-to‑learn: work with teachers or employers to obtain extra time for assignments, quiet test environments, and note‑taking assistance.

Support Resources

• CDC “Concussion in Youth Sports” website
• Brain Injury Association of America (BIA) support groups
• Local athletic trainers or concussion specialists

Prevention

• Wear appropriate protective gear: helmets that meet sport‑specific standards; ensure proper fit.
• Enforce safe play rules: no “head‑butting,” limit body checking in youth leagues.
• Strength and conditioning: neck‑strengthening exercises reduce head acceleration during impacts.
• Fall‑prevention strategies for seniors: remove loose rugs, install grab bars, maintain good lighting.
• Educate: coaches, parents, and athletes on concussion signs and the importance of reporting.
• Limit alcohol & drug use: intoxication masks symptoms and worsens outcomes.

Complications

While most concussions resolve without lasting effects, untreated or poorly managed cases can lead to:

• Post‑Concussion Syndrome (PCS): persistent headache, dizziness, and cognitive difficulties >3 months.
• Second‑Impact Syndrome: a rare, often fatal condition when a second concussion occurs before the first has healed, causing rapid brain swelling.
• Cognitive decline: repeated mild TBIs are linked to chronic traumatic encephalopathy (CTE), a neurodegenerative disease.
• Mood disorders: increased risk of depression, anxiety, and suicidal ideation.
• Balance and vestibular dysfunction: may persist, increasing fall risk.

When to Seek Emergency Care

Even if symptoms seem mild, it is wise to have a healthcare professional evaluate the injury, especially for children, seniors, or anyone taking blood‑thinning medication.

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References

1. Centers for Disease Control and Prevention. “Traumatic Brain Injury in the United States: Fact Sheet.” 2022.
2. Maas AIR, et al. “Traumatic brain injury: integrated approaches to improve prevention, clinical care, and research.” Lancet Neurology. 2020.
3. Zemek R, et al. “Sex differences in concussion outcomes in adolescent athletes.” Journal of Athletic Training. 2021.
4. Consensus Statement on Concussion in Sport – 5th International Conference on Concussion in Sport, Berlin 2016 (SCAT‑5 guidelines).
5. Mayo Clinic. “Concussion.” Updated 2024.

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