Head Injury Warning Signs
The tricky thing about head injuries is that the most dangerous ones do not always announce themselves right away. A person who takes a blow to the head at a Pinellas County Schools football game or a Clearwater Beach tumble and walks away talking can still be in serious trouble, not in the next five minutes, but in the next few hours or days. Blood pooling between the brain and skull, brain swelling building slowly, a small bleed expanding into something critical: these processes often begin while the person feels relatively okay. Recognizing the warning signs that distinguish a routine bump from a serious traumatic brain injury is one of the most practical emergency skills anyone can develop.
The information that follows aligns with CDC HEADS UP guidance on concussion recognition.
Common Signs of a Concussion
A concussion is a mild traumatic brain injury caused by a bump, blow, or jolt to the head that causes the brain to move rapidly inside the skull. Most concussions do not involve a loss of consciousness, in practice, fewer than one in ten do, so the absence of blacking out does not mean the brain was not affected. Concussion symptoms can appear immediately or take hours to develop, and some people do not notice them until the following day.
Concussion symptoms fall into four categories. Physical: headache, nausea or vomiting, dizziness, blurry or double vision, sensitivity to light or noise, balance problems. Cognitive: mental fog, trouble concentrating or remembering, confusion about what just happened. Emotional: irritability, sadness, anxiety, or feeling more emotional than usual. Sleep: more or less than normal, trouble falling asleep, unusual daytime drowsiness. Any combination of these symptoms following a hit to the head suggests a concussion and warrants removal from the activity and medical evaluation.
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One additional sign worth understanding: repeated vomiting after a head injury, vomiting more than once, is a different signal than a single episode of nausea. A single vomit in the first minutes after a hard impact can be a concussion symptom. Repeated vomiting suggests elevated pressure inside the skull and moves the situation from concussion territory into danger-sign territory.
Head Injury Danger Signs
Beyond concussion symptoms, there is a separate category of findings that indicate a potentially life-threatening brain injury, a skull fracture, a bleed between the brain and skull, or significant brain swelling. These danger signs require immediate emergency response, not watchful waiting.
The CDC identifies the following as danger signs in adults and older children after a head injury: one pupil larger than the other, extreme drowsiness or inability to be woken up, a headache that is getting significantly worse rather than gradually better, slurred speech, repeated vomiting, seizures or convulsions, increasing confusion or unusual behavior, and loss of consciousness for any period. Any of these requires calling 911 immediately.
Two signs deserve particular attention because they are easy to underestimate. Slurred speech after a head injury is a neurological warning, the areas of the brain controlling speech are affected, which means the injury is more than a surface bump. Unequal pupils, one pupil visibly larger than the other, suggests pressure building on one side of the brain and is one of the clearest indicators that something serious is happening. Neither of these findings should prompt “let’s wait and see.”
When to Call 911
Call 911 immediately, do not drive the person to the hospital yourself, if the person loses consciousness at any point, has a seizure, vomits repeatedly, develops worsening headache, has slurred speech or unequal pupils, or shows increasing confusion or agitation. Also call 911 if the mechanism of injury was severe: a high-speed vehicle accident, a fall from significant height, or a direct high-force impact to the skull.
While waiting for emergency services: keep the person still and avoid moving the head or neck unless necessary to maintain an open airway. If you suspect a spinal injury alongside the head injury, which is always a possibility in high-impact trauma, do not move the person unless they are in immediate danger and you cannot wait for EMS. If the person is unconscious and breathing, place them in the recovery position only if you have ruled out a spinal injury or they are in danger of choking. If they are not breathing, CPR takes priority.
One situation people frequently misjudge: the person who seemed fine immediately after the injury but becomes progressively more confused or lethargic over the following hours. This pattern, called a “lucid interval”, is associated with epidural hematoma, a bleed in the space between the skull and the outer membrane of the brain. It is a medical emergency. The window between lucid interval and rapid deterioration can be short.
What to Watch for in Children
Infants and toddlers cannot describe what they are experiencing, which makes head injury assessment harder in younger children. After a hit to the head in an infant or young child, watch for: any bump or bruise on the head, especially one that appears to be growing or feels soft and fluctuant in the center; prolonged or inconsolable crying that cannot be explained; unusual sleepiness or difficulty waking; refusal to eat; vomiting more than once; seizures; loss of consciousness even briefly; or a marked change in behavior or alertness.
In older children who can communicate, the same concussion signs apply as in adults, headache, confusion, feeling foggy, balance problems, sensitivity to light, plus age-specific signs like seeming dazed after the hit, not remembering what happened, or behaving differently than normal. Children recover from concussions at a different rate than adults and should be evaluated by a physician before returning to sports, physical activity, or full academic work.
A specific caution for infants: any fall from a surface higher than the infant’s own length, a changing table, a couch, a high counter, warrants a call to a pediatrician or evaluation in urgent care, even if the infant seems fine. The infant skull is thinner and the brain less protected than an adult’s, and internal injuries can occur without visible external signs.
What to Do After a Head Injury
For a head injury that does not involve the emergency danger signs described above, a bump or mild to moderate concussion, the immediate priorities are rest and monitoring. Remove the person from the activity. Do not return to sports, physical work, or anything requiring significant concentration until symptoms have resolved. Both physical and cognitive rest matter: screens, reading, and intensive mental tasks can prolong concussion symptoms, and returning to physical activity before the brain has recovered increases the risk of a second concussion with far more serious consequences.
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Monitor the person for the first 24 hours. You do not need to keep someone with a mild concussion awake all night, that is an outdated recommendation, but you should wake them periodically to confirm they are responsive and not deteriorating. If new symptoms appear during this period, or if existing symptoms are getting significantly worse rather than gradually better, seek medical attention. Symptoms that take hours or days to fully emerge are normal with concussion, but worsening symptoms after initial stabilization are not.
For pain, acetaminophen is the appropriate choice during the first 24 hours after a head injury. NSAIDs like ibuprofen or aspirin are blood thinners and should be avoided initially in case there is a small bleed that has not yet been ruled out. Follow up with a physician for any head injury involving loss of consciousness, confusion, repeated vomiting, or symptoms that do not begin improving within a day or two.