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Basic first aid

Head injuries and concussion

Most bumps to the head are minor, but some cause concussions or bleeding in the brain. Know the danger signs and when to get help.

Call 911 right away if:
  • The person was knocked out, even for a moment, or can’t be woken up
  • They have a seizure, repeated vomiting, or a headache that gets worse and won’t go away
  • One pupil (the black center of the eye) is bigger than the other
  • Slurred speech, weakness, numbness, or trouble walking or with balance
  • They are very confused, restless, agitated, or acting strangely, or don’t recognize people or places
  • Clear fluid or blood is coming from the nose or ears, or there is a deep cut or dent in the skull
  • You think the neck or back may be hurt
  • A baby or young child won’t stop crying or won’t nurse or eat

Signs of a concussion

A concussion is a brain injury caused by a bump, blow, or jolt to the head or body. Signs may show up right away or hours later:

  • Headache or a feeling of pressure in the head
  • Dizziness, balance problems, or blurry vision
  • Nausea or vomiting
  • Feeling foggy, slowed down, or confused
  • Trouble remembering what happened
  • Bothered by light or noise
  • Mood changes, like being irritable or sad, or sleeping more or less than usual

What to do

  1. Don’t move the person if you think the neck or back is hurt. Keep their head and neck still and call 911.
  2. Stop any bleeding by pressing gently with a clean cloth. Don’t press hard if you think the skull may be broken.
  3. Put a cold pack wrapped in a cloth on a bump for up to 20 minutes at a time.
  4. Stay with them. Have a responsible adult stay with the person for the first 24 hours and watch for danger signs.
  5. Rest the brain and body. Take it easy for a day or two, then slowly return to normal activities as symptoms allow.

Sports and play

If a concussion is possible, stop playing for the day. “When in doubt, sit them out.” Don’t return to sports until a health care provider says it’s OK. A second head injury before the brain heals can be very serious.

Avoid

  • Avoid alcohol and drugs while healing.
  • Don’t drive until a health care provider says it’s safe.
See a doctor or go to urgent care if:
  • Any signs of a concussion appear, even mild ones
  • The person takes a blood thinner or is an older adult — get checked right away, even if the injury seems minor (an emergency room is often best)
  • Symptoms don’t go away or get worse over the next days or weeks

Sources

Last reviewed October 14, 2026. General information only, not medical advice. Read the disclaimer.