Traumatic Brain Injury Warning Signs After an Accident
This general information is not medical or legal advice, and state law controls any claim. After an accident, call 911 for an emergency rather than waiting for online guidance. CDC and NIH guidance can help, but a clinician must evaluate the person.
Call 911 for danger signs
Call 911 for loss of consciousness that concerns you, repeated vomiting, a seizure, increasing confusion, unusual behavior, inability to wake, slurred speech, weakness or numbness, unequal pupils, or a worsening severe headache. Keep the person safe and follow the dispatcher's directions.
Watch for less obvious symptoms
A mild traumatic brain injury may involve headache, dizziness, balance trouble, light or noise sensitivity, fatigue, slowed thinking, memory difficulty, irritability, anxiety, or sleep changes. Symptoms can appear later, so observe and communicate changes to a clinician.
Arrange a medical assessment
Contact a health professional after a blow, jolt, or penetrating injury even when the person seems well, especially for a child, older adult, or someone taking blood thinners. Do not return to driving, sports, or hazardous work until advised.
Document without self-diagnosing
Write when and how the impact occurred, observed behavior, symptoms, medications, witnesses, and care received. Do not force a person to stay awake, give unapproved medication, or treat a symptom log as a substitute for care.
Understand recovery and follow-up
Follow discharge instructions and schedule reassessment when symptoms persist or change. Recovery varies; persistent cognitive, emotional, balance, or sensory problems deserve continued medical attention and practical accommodations.
Frequently asked questions
When should I call 911?
Call 911 for worsening consciousness or confusion, seizure, repeated vomiting, weakness, slurred speech, unequal pupils, or another emergency sign.
Can a concussion occur without passing out?
Yes. Loss of consciousness is not required; symptoms after a blow or jolt still warrant medical advice.
Can symptoms start later?
Yes. Monitor for changes and seek urgent help if danger signs develop.
Should someone with a head injury sleep?
Follow the treating clinician's instructions. If the person is difficult to wake or deteriorates, call 911.
Can I return to sports immediately?
No. Return should be gradual and guided by a health professional.
Why keep a symptom log?
A dated log helps clinicians identify trends and helps explain functional changes without replacing an examination.
Sources
Sources were verified September 9, 2026. This page does not claim attorney authorship, review, or approval. Check current official sources and local law.
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