After a head injury, the most important thing you can do is assess severity. Most head injuries are mild and recover fully within days to weeks, but some require emergency care within minutes. Your immediate priority is watching for danger signs, managing pain safely, and giving your brain the rest it needs to heal.
Danger Signs That Need Emergency Care
Call 911 or get to an emergency department immediately if any of these appear after a bump, blow, or jolt to the head:
- Seizures or convulsions
- One pupil larger than the other, or double vision
- Repeated vomiting
- Loss of consciousness, increasing drowsiness, or inability to stay awake
- A headache that keeps getting worse and won’t go away
- Slurred speech, weakness, numbness, or loss of coordination
- Unusual confusion, agitation, or inability to recognize people or places
These signs can appear immediately or develop over the first several hours. Some, like worsening headache or increasing confusion, may not show up until well after the initial injury. That’s why monitoring matters even when someone initially seems fine.
First Aid in the First Few Minutes
If the injury seems potentially serious, keep the person still. Have them lie down with their head and shoulders slightly raised. Do not move their neck, and don’t remove a helmet if they’re wearing one. Moving someone with a possible spinal injury can cause additional damage, so wait for emergency medical help to arrive and evaluate the situation.
If there’s bleeding, apply firm pressure with a clean cloth or sterile gauze. The one exception: if you suspect a skull fracture (visible deformity, clear fluid draining from the nose or ears), don’t press directly on the wound. While waiting for help, keep watching their breathing and alertness. If they stop breathing or showing signs of circulation, begin CPR.
For milder injuries where the person is conscious and alert, have them sit or lie down in a comfortable position. Apply a cold pack wrapped in a cloth to any bumps or swelling for 15 to 20 minutes at a time.
Pain Relief: What’s Safe and What’s Not
This is one of the most important things to get right. If you have a headache after a head injury, acetaminophen (Tylenol) is the safe choice. Do not take ibuprofen (Advil, Motrin) or aspirin. Both of these are blood thinners that can increase the risk of bleeding in or around the brain. This applies for at least the first several days after injury, and you should confirm with a healthcare provider before switching to anything else.
The First 48 Hours: Rest Your Brain
Current guidelines recommend both physical and cognitive rest for the first 24 to 48 hours after a concussion. Cognitive rest means limiting activities that force your brain to work hard. That includes reading, working, studying, and especially screen time. Phones, television, video games, and computers all count.
A randomized clinical trial of 125 patients found that those who avoided screens entirely for the first 48 hours recovered faster, with greater likelihood of full symptom resolution by day 10 compared to those who used screens as tolerated. Two days without your phone is a small trade for a meaningfully shorter recovery.
Physical rest during this window means avoiding exercise, heavy lifting, and anything that raises your heart rate significantly. Light activity like short walks is generally fine if it doesn’t worsen symptoms. The goal isn’t to lie in a dark room doing nothing for days. It’s to avoid the specific activities that stress a healing brain.
Sleep Is Good, Not Dangerous
You may have heard that you shouldn’t let someone sleep after a head injury, or that you need to wake them every hour. This is outdated advice. There is no evidence that waking someone up after a concussion is needed or beneficial. Rest is one of the most important parts of recovery, and interrupting sleep actually works against healing. A full eight hours of sleep does more good than hourly check-ins.
What you can do is quietly check on the person to confirm their breathing looks normal and they appear to be resting peacefully. You don’t need to wake them to do this. If their breathing pattern seems abnormal, wake them immediately and seek medical attention.
What Recovery Looks Like
For most otherwise healthy people, concussion symptoms are worst in the first few hours and gradually improve over days. The majority of people recover significantly within one month, and many feel better within one to two weeks without any treatment beyond rest and basic symptom management.
Common symptoms during recovery include headache, fatigue, dizziness, trouble concentrating, difficulty sleeping, irritability, and sensitivity to light or noise. These are normal and expected. They should be getting gradually better, not worse. If symptoms are intensifying days after the injury rather than improving, that warrants medical evaluation.
If symptoms persist beyond three months, this is classified as persistent post-concussion syndrome. Diagnosis typically requires ongoing cognitive difficulties with attention or memory plus at least three other symptoms like headaches, fatigue, sleep problems, dizziness, or personality changes. This affects a minority of people but benefits from specialized treatment.
Returning to Physical Activity
Getting back to exercise and sports after a concussion follows a gradual, step-by-step progression. Each step takes a minimum of 24 hours, and you only move forward if the previous step didn’t trigger symptoms. If symptoms return at any stage, you go back to the previous step.
- Step 1: Return to regular daily activities like school or work, with healthcare provider approval to begin the progression.
- Step 2: Light aerobic activity only, such as 5 to 10 minutes of walking, light jogging, or stationary biking. No weight lifting.
- Step 3: Moderate activity that increases heart rate with body or head movement, including moderate jogging and reduced-intensity weight lifting.
- Step 4: Heavy non-contact activity like sprinting, full weightlifting routines, and sport-specific drills.
- Step 5: Full practice including contact, in a controlled setting.
- Step 6: Return to competition.
At its fastest, this progression takes about a week. Many people need longer. Rushing it isn’t just uncomfortable; it’s genuinely dangerous.
Why a Second Hit Is So Dangerous
After a concussion, your brain enters a period of altered metabolism that can last up to ten days. During this window, the brain’s normal ability to regulate blood flow and manage swelling is compromised. Chemical changes inside brain cells make them far more vulnerable than usual.
If you sustain a second head injury before the first one has healed, the brain can lose its ability to control pressure and swelling entirely. This is called second impact syndrome, and it can cause massive brain swelling, herniation, and death, even from a hit that would normally be minor. This is the core reason behind the graduated return-to-activity protocols and why no one should return to contact sports while still experiencing any concussion symptoms. The vulnerability window of up to ten days means even feeling “mostly fine” isn’t the same as being fully healed.