Concussion in Kids: Signs, Recovery, and When to Go to the ER

Head injuries in children are common — falls from playground equipment, sports collisions, bike crashes, bumping heads on furniture, and the ordinary tumbles of childhood. Most are minor and need nothing more than a hug, a cold pack, and some observation. But some cause concussions, and knowing the difference between a bump that will form a goose egg and a brain injury that needs medical attention matters for your child's short-term and long-term brain health.

What a Concussion Actually Is

A concussion is a mild traumatic brain injury caused by a bump, blow, or jolt to the head — or even a blow to the body that causes the head to move rapidly — that disrupts normal brain function. When the head experiences sudden acceleration or deceleration, the brain moves inside the skull, stretching and compressing neural tissue. This causes chemical changes in the brain and sometimes damages brain cells, temporarily affecting how the brain processes information, regulates emotions, and controls physical functions.

Several important facts that many parents don't know: concussions don't show up on CT scans or MRIs — these imaging tests check for structural damage like bleeding or skull fractures, but concussions involve chemical and microscopic cellular changes that are invisible on imaging. A normal CT scan does not mean your child doesn't have a concussion. Concussions are diagnosed based on the mechanism of injury and the presence of characteristic symptoms. You do not need to lose consciousness to have a concussion — in fact, fewer than 10 percent of concussions involve loss of consciousness. The absence of a "knockout" does not mean the absence of a concussion. And there doesn't need to be a visible bump, bruise, or mark on the head for a concussion to have occurred.

Recognizing Symptoms

In Older Children and Teens

Concussion symptoms can appear immediately after the injury or may develop gradually over hours, which is why monitoring for 24 to 48 hours after a head injury is essential. A headache that doesn't improve or gets worse over time is the most common symptom. Dizziness and balance problems — the child may feel unsteady, complain the room is spinning, or walk into things they normally navigate easily. Nausea or vomiting, particularly if it persists or worsens. Sensitivity to light and noise — bright lights and loud sounds feel physically uncomfortable. Cognitive symptoms include feeling foggy, confused, or mentally slowed down, difficulty concentrating on tasks, trouble remembering recent events or instructions, and answering questions more slowly than usual.

Mood and behavioral changes are common but often overlooked as concussion symptoms: increased irritability, unexpected sadness or tearfulness, heightened anxiety, and emotional responses that seem disproportionate to the situation. Sleep disturbances go in both directions — some children sleep much more than usual while others have difficulty falling or staying asleep. A child who is "not themselves" after a head injury — even if they can't articulate specific symptoms — may be concussed.

In Babies and Toddlers

Young children can't describe their symptoms, which makes concussion recognition more challenging and observation more critical. Watch for unusual, inconsolable fussiness or crying — particularly if it's different from their typical crying patterns. Changes in eating patterns, either refusing to eat or vomiting after the injury. Changes in sleeping patterns — excessive drowsiness or unusual difficulty sleeping. Loss of previously acquired skills or interest in favorite toys, books, or activities. Unsteadiness when walking, crawling, or reaching for objects that they normally manage without difficulty. A dazed, glazed, or stunned appearance — looking "off" even if you can't pinpoint exactly what's different. Any regression in behavior, like a potty-trained toddler having accidents or a child who was sleeping through the night suddenly waking repeatedly.

Immediate Steps After a Head Injury

Remove the child from whatever activity they were doing immediately. If they were playing a sport, they should not return to play that day regardless of how quickly they seem to recover — symptoms can be masked by adrenaline and emerge later. Apply a cold pack wrapped in a cloth (not directly on skin) to any visible bump for 15 to 20 minutes. This reduces swelling and provides comfort but doesn't address the underlying brain injury.

Monitor the child closely for the next 24 to 48 hours, watching for the development or worsening of any symptoms listed above. Allow rest but don't keep them awake unnecessarily — the old advice to wake a child every hour overnight after a head injury is no longer standard recommendation unless specifically directed by a physician. Current evidence shows that sleep is actually beneficial for brain recovery. It's safe to let them sleep, but check on them periodically to ensure they're responsive if you gently rouse them and that their breathing pattern is normal.

For the first 24 to 48 hours after injury, limit activities that require concentration, including homework, video games, and extensive screen time. These cognitive demands can worsen symptoms. Light activity — gentle walking, quiet play, brief reading — is generally fine if it doesn't provoke symptoms. Complete "brain rest" in a dark, silent room is no longer recommended as it can actually slow recovery and cause mood problems.

Related: When to Take Your Child to the ER

When to Go to the ER

While most head injuries don't require emergency care, certain signs indicate a more serious injury — potentially a skull fracture, brain bleed, or brain swelling — that needs immediate evaluation. Go to the emergency room immediately if there's any loss of consciousness, even briefly. If the child is confused about where they are, what happened, or doesn't recognize familiar people. If vomiting occurs more than twice after the injury, or if vomiting begins or increases hours after the initial injury. If one pupil is noticeably larger than the other (check in good light). If the child is extremely drowsy and can't be easily awakened, or if they become progressively harder to rouse. If the headache is severe, persistent, and worsening rather than gradually improving.

If there's clear or blood-tinged fluid draining from the nose or ears (which may indicate a skull fracture). If the child has a seizure. If you notice weakness or numbness in the arms or legs, or if one side of the body seems weaker than the other. If speech becomes slurred or the child has difficulty finding words. If coordination deteriorates noticeably. If the injury involved a significant mechanism — a high-speed collision, a fall from a significant height (more than 3 feet for toddlers, more than 5 feet for older children), being struck by a heavy or high-velocity object, or a car accident. For babies under 12 months, any head injury that involves more than a minor bump warrants at least a phone call to the pediatrician, as young infants' skulls are more vulnerable.

Recovery: What Current Evidence Shows

Most childhood concussions resolve within 2 to 4 weeks with appropriate management. The good news is that children's brains are remarkably resilient, and the vast majority of concussed children make a complete recovery with no lasting effects. Current guidelines, updated significantly in recent years, recommend 1 to 2 days of relative cognitive and physical rest — not complete isolation in a dark room, but reducing demanding activities. After that initial rest, a gradual return to normal activities guided by symptoms.

Return to school should happen before full return to sports, often within a few days to a week of the injury. Temporary academic accommodations may be needed: reduced workload, extra time on tests, permission to take breaks, reduced screen time, and a quiet space for rest if symptoms flare during the school day. Most schools have concussion protocols in place — communicate with the school nurse and teachers about your child's recovery needs.

Return to sports follows a specific stepwise protocol that must be supervised by a healthcare provider. The stages are: symptom-limited activity (light walking), then light aerobic exercise, then sport-specific exercise, then non-contact training drills, then full-contact practice after medical clearance, and finally return to game play. Each step should take a minimum of 24 hours, and if symptoms return at any step, the child drops back to the previous symptom-free step and waits another 24 hours. A child should be completely symptom-free at rest and during exertion before returning to contact sports.

When Recovery Takes Longer

About 15 to 30 percent of children experience prolonged symptoms lasting longer than 4 weeks, sometimes called post-concussion syndrome. Risk factors for slower recovery include previous concussions, a history of migraines, anxiety or depression, and delayed initial rest. If symptoms persist beyond 4 weeks, your pediatrician may refer to a concussion specialist, pediatric neurologist, or multidisciplinary concussion clinic for more comprehensive management. Persistent symptoms don't mean permanent damage — they usually indicate that the brain needs additional recovery time and possibly targeted rehabilitation for specific symptoms.