The first 72 hours after a suspected brain injury set the course for everything that follows — medically and, if a claim becomes necessary, legally. The order of operations is simple: emergency care first, then careful documentation, then protecting your options. Here is what that looks like, hour by hour.
First: get emergency help
If a head injury is suspected and any warning sign is present — loss of consciousness (even brief), confusion, repeated vomiting, seizures, slurred speech, weakness, unequal pupils, clear fluid from the nose or ears, or a headache that is severe or worsening — call 911. Do not drive the injured person yourself if they show these signs; emergency responders can stabilize the spine and monitor consciousness en route.
Even without dramatic symptoms, err toward evaluation. The Mayo Clinic advises seeing a doctor for any blow to the head that concerns you or causes behavioral changes, and seeking emergency care for any signs of traumatic brain injury after a head impact. The Brain Injury Association of America likewise urges prompt professional evaluation, noting that secondary injuries — swelling, bleeding, blood-flow changes — can develop after the initial impact.
Tell the 911 dispatcher it is a possible head injury so the right resources are sent. Keep the injured person still, awake, and talking if possible; note the time of the injury and any loss of consciousness, however brief. That timestamp matters later.
At the scene and in the ER
While waiting for help — or in the emergency department — a few actions pay dividends for weeks:
- Say what happened, plainly. Tell responders and ER staff the mechanism: “rear-ended at a stoplight,” “fell from a ladder,” “struck by a falling toolbox.” Mechanism guides diagnosis.
- List every symptom, even ones that feel minor or embarrassing: headache, nausea, dizziness, confusion, ringing ears, mood changes. What gets said becomes the medical record; what doesn’t, didn’t happen — at least on paper.
- Mention medications, especially blood thinners. The CDC flags these as raising the risk of brain bleeding after a TBI.
- Get names. The responding officers, the ER doctor, the nurses. You will want them later.
- Ask what to watch for at home. Discharge instructions exist because delayed symptoms are expected, not exceptional.
If police respond to the incident — a crash, an assault — make sure a report is filed and get the report number before you leave. Photograph the scene, the vehicles, the hazard, and any visible injuries if it is safe to do so; phone photos with timestamps are perfectly good evidence.
Hours 1–24: stabilize and observe
The first day is about watchful rest under medical guidance:
- Follow discharge instructions exactly, including any “return if” triggers. Wake the person as instructed if the doctor advised periodic checks.
- Do not leave the person alone for the first 24 hours if a concussion is suspected. A responsible adult should stay with them.
- Avoid alcohol, sedatives, and anything that masks symptoms — they can hide deterioration and interact badly with an injured brain.
- Rest the brain, not just the body. Screens, bright lights, and intense concentration can worsen early symptoms. This is temporary, not permanent.
- Start the paper trail. Create a simple folder — physical or digital — and drop in the ER discharge papers, prescriptions, and receipts. Date everything. Our documentation guide turns this starter folder into a complete system.
Watch for the delayed arrival of symptoms: headache intensifying, new nausea, growing confusion, unusual sleepiness, or personality shifts. The symptoms checklist is designed for exactly this surveillance period — work through it daily for the first week.
Hours 24–72: follow up and document
By the second and third day, the rhythm shifts from emergency response to steady management:
- Keep follow-up appointments. See the primary-care doctor or the specialist the ER referred you to, even if you feel better. Gaps in care are the single most common documentation weakness in later claims.
- Begin the symptom journal. Each day, note headaches, dizziness, sleep, mood, memory lapses, and anything you couldn’t do — work tasks, school, driving, childcare. One honest line per day beats a perfect retrospective written months later.
- Notify the right parties in writing. Employer (for a workplace injury), property owner or manager (for a fall), your auto insurer (for a crash). Keep copies of everything you send.
- Collect witness contacts while memories are fresh — a short text (“Can I keep your number in case questions come up later?”) is enough.
- Save every bill and receipt: ER, pharmacy, imaging, mileage to appointments, help hired around the house. Small costs accumulate into real damages.
If new or worsening symptoms appear during this window, do not “wait and see” them away — call the doctor’s office or return to urgent care, and make sure the visit is documented. Each visit extends the medical timeline that a claim will later rely on.
Special situations
If the injured person is a child. You are their voice and their memory. Watch behavior rather than waiting for complaints, keep them home from school and sports until cleared, and get medical clearance in writing before any return to play. Children’s symptoms can be subtle — a normally sunny child gone withdrawn deserves evaluation.
If the injured person is an older adult. Take an even lower threshold for emergency evaluation, especially if they take blood thinners. The CDC specifically warns that TBI symptoms in older adults are easily mistaken for other conditions, so tell every provider about the fall or impact explicitly — don’t assume they’ll connect it.
If you are alone with the injured person. Call 911 rather than driving them yourself if any warning sign is present. If they seem okay but you’re unsure, call a nurse advice line or the doctor’s office and describe what happened — a professional triage call beats solitary guesswork.
If there is a language barrier. Ask for an interpreter at the hospital — it is your right. Make sure discharge instructions are understood before leaving, and have a bilingual friend or family member review them with you at home.
What NOT to do in the first 72 hours
Mistakes made now are the hardest to undo:
- Don’t skip or delay medical care because you “feel okay.” Adrenaline masks symptoms, and a gap before the first visit invites doubt about what caused the injury.
- Don’t give a recorded statement to the other party’s insurer. You may confirm basic facts (date, location, that you are getting care) and politely decline the rest until you understand the situation.
- Don’t sign anything — releases, waivers, broad medical authorizations, or settlement offers — without understanding it. Early releases can permanently end rights you didn’t know you had.
- Don’t post about the incident on social media. Photos of you smiling at a barbecue will be found and will be used to argue you are fine, whatever the context.
- Don’t speculate about fault in writing or on the record — to police, to insurers, to the other party. State facts; leave conclusions for later.
- Don’t throw anything away. Damaged helmets, torn clothing, the shoes you fell in — preserve them.
- Don’t assume a normal scan means no injury. Concussions routinely don’t appear on CT; follow the clinical guidance, not the image alone.
Protecting your future options
Nothing in the first 72 hours obligates you to file a claim — but everything you do either preserves or erodes the option. Think of it as keeping doors open: the medical record stays continuous, the evidence stays intact, and no premature statement or signature narrows what comes next.
This is also the right window to learn the landscape. Reading the complete step-by-step claim guide now — before an adjuster calls — means you will recognize each phase as it arrives instead of meeting it blind. And if the injury is serious, this is the time to at least consult a qualified attorney; early advice is cheaper than repairing early mistakes.
Key takeaways
– Call 911 for any warning sign; when in doubt, get evaluated — secondary injuries can develop after the initial impact.
– At the scene and in the ER: state the mechanism plainly, list every symptom, mention blood thinners, and get names and report numbers.
– In the first 24 hours: supervised rest, no alcohol or sedatives, and start a dated folder with every paper you receive.
– In hours 24–72: keep follow-ups, start a daily symptom journal, notify parties in writing, and save every receipt.
– Don’t give recorded statements, sign releases, post on social media, or speculate about fault — keep every option open.
Frequently asked questions
Should I go to the ER if I feel fine after hitting my head?
If the blow concerns you or caused any behavioral change, yes — get evaluated. Adrenaline and shock mask symptoms, and some dangerous developments (like slow bleeds) announce themselves late.
Can a family member make these decisions if the injured person can’t?
Yes. If the person is confused, unconscious, or a minor, a family member should speak for them: calling 911, giving the history to doctors, and starting the documentation. Note who is acting and why.
How soon should I contact a lawyer?
There is no required timeline, but an early consultation — even a brief one — helps you avoid the irreversible mistakes listed above. If liability is disputed or injuries are significant, sooner is better.
What if the injury happened at work?
Report it to your employer in writing immediately and keep a copy, then get medical care through the proper channel. Workplace injuries follow a parallel track (workers’ compensation) with its own deadlines — report first, sort out the details after.
This article is general information, not legal or medical advice. It does not create an attorney-client relationship. Consult a qualified attorney about your situation, and see a doctor promptly for any head injury.