After hitting your head, the most important thing to do is stop what you’re doing, sit or lie down, and pay close attention to how you feel over the next several hours. Most head bumps don’t cause serious injury, but the brain can bleed or swell in ways that aren’t obvious right away. What you do in the first minutes and hours matters.
The First Few Minutes
Lie down with your head and shoulders slightly elevated. Don’t jump back into whatever you were doing, whether that’s a sport, yard work, or driving. If someone else hit their head, keep them still and avoid moving their neck. If they’re wearing a helmet, leave it on.
Apply a cold pack or a bag of ice wrapped in a cloth to any visible bump or swelling. Keep it on for 15 to 20 minutes at a time. This helps reduce swelling at the surface, though it won’t affect what’s happening deeper inside the skull.
For pain, stick with acetaminophen (Tylenol). Avoid ibuprofen (Advil, Motrin) and aspirin for at least the first 24 to 48 hours. These are blood thinners, and if there’s any bleeding inside the skull, they can make it worse. Both ibuprofen and acetaminophen are commonly used for head injury pain in emergency settings, but acetaminophen is the safer choice in the immediate aftermath when internal bleeding hasn’t been ruled out.
Danger Signs That Need Emergency Care
Most head injuries are mild, but some develop into emergencies. The CDC identifies these specific red flags that warrant a 911 call or an immediate trip to the emergency room:
- Seizures or convulsions (shaking or twitching)
- Repeated vomiting (not just once)
- Worsening headache that won’t go away
- One pupil larger than the other, or double vision
- Slurred speech, weakness, numbness, or loss of coordination
- Increasing confusion, unusual behavior, restlessness, or agitation
- Loss of consciousness, increasing drowsiness, or inability to stay awake
These symptoms can appear within minutes or take hours to develop. That delay is the reason monitoring matters so much.
Why You Can Feel Fine and Still Be in Danger
One of the most dangerous patterns after a head injury is called a “lucid interval.” A person gets hit, may briefly lose consciousness, then wakes up and seems fine. They talk, walk around, and appear normal. But inside the skull, a blood vessel is slowly leaking, and pressure is building against the brain. Within minutes to hours, they suddenly deteriorate.
This pattern occurs in roughly 15 to 30 percent of cases involving a type of brain bleed called an epidural hematoma. For slower-forming bleeds and brain swelling, symptoms can take up to a couple of days to appear. About 10 to 25 percent of these bleeds enlarge within the first 36 hours. This is why “I feel fine” is not a reliable indicator that everything is okay, especially in the first 24 hours.
How to Check on Someone at Home
If someone hit their head and you’re watching them, there are three things to monitor, the same three things emergency doctors assess. You don’t need medical training to do this.
First, check their eyes. Are they opening their eyes on their own, or do you have to talk to them or even shake them to get a response? Second, talk to them. Do they know where they are, what day it is, and what happened? Confused or nonsensical answers are a warning sign. Third, ask them to do something simple, like squeeze your hand or lift their arms. If they can’t follow a basic command, or if one side responds differently than the other, that’s an emergency.
Repeat these checks every couple of hours for the first 24 hours. If the person is sleeping, it’s okay to let them rest, but wake them every two to three hours to run through these quick checks. If they become harder to wake up or their responses get worse over time, call 911.
Skip the Caffeine and Alcohol
Avoid caffeine for at least the first few days after a head injury. After a hit to the head, the brain releases a protective compound called adenosine that helps limit inflammation and neuronal damage. Caffeine directly blocks this compound from doing its job. Animal studies have shown that caffeine consumed immediately after a brain injury significantly worsens neurological damage, increases brain swelling, and raises mortality. This isn’t a theoretical concern. The mechanism is well understood: caffeine strips away one of the brain’s built-in defense systems at exactly the moment it’s needed most.
Alcohol should also be avoided. It impairs your ability to notice worsening symptoms, thins the blood, and adds further stress to a brain that’s already working to recover.
Rest Your Brain, Not Just Your Body
Physical rest is obvious, but cognitive rest is just as important and often overlooked. For the first one to two days, the CDC recommends limiting screen time and avoiding activities that are physically or mentally demanding. That includes work emails, video games, intense reading, and loud or stimulating environments.
This doesn’t mean lying in a dark room doing nothing for a week. Brief, light activities are fine. But the brain heals by reducing its workload, and pushing through mental tasks too early can prolong symptoms like headaches, difficulty concentrating, and fatigue. Think of it as giving a sprained ankle time before running on it. Gradually increase mental and physical activity as symptoms allow.
Why a Second Hit Is Especially Dangerous
If you’ve already had a concussion or a significant head impact, getting hit again before your brain has recovered can be catastrophic. This is called second impact syndrome, and while it’s rare, it can cause fatal brain swelling within two to five minutes, sometimes too fast to even reach a hospital.
After a concussion, the brain enters a state of altered metabolism that can last up to ten days. Potassium floods the space between brain cells, and the brain burns through energy trying to restore balance. During this window, even a relatively minor second impact can cause the brain to lose its ability to regulate pressure and blood flow. The resulting swelling and herniation can be fatal.
This is the reason athletes are held out of play after a concussion, and it’s the reason you should avoid any activity with a risk of another head impact for at least one to two weeks, or until all symptoms have fully cleared.
What Recovery Looks Like
Most mild head injuries resolve on their own. Headaches, mild dizziness, difficulty concentrating, and feeling “off” for a few days are normal. These symptoms typically improve within one to two weeks for adults, though some people take longer.
During recovery, ease back into your normal routine gradually. If a particular activity brings symptoms back or makes them worse, that’s your signal to pull back and try again in another day or two. Sleep as much as your body wants. Stay hydrated. Eat regular meals. And keep someone informed about how you’re feeling so they can notice changes you might miss yourself.