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Should You Worry About Minor Head Injuries?

Repeated trauma over time can have a cumulative effect

woman with ice on concussed head

Scenario one: You’re playing ball, get beaned in the head and start to feel nauseous and dizzy. Uh-oh. You know there’s a possibility of a concussion, so you go to your nearest emergency room.


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Scenario two: Same ballgame, same beaning, but you feel fine. No need to worry or see a doctor, right?

Well, you may want to reconsider. In this Q&A, concussion expert Richard Figler, MD, discusses these minor head injuries, called subconcussive hits, and their impact on the brain.

Q: What is considered a mild head injury?

A: A concussion happens when you get hit in the head hard enough to cause a transient disturbance of brain function or causes your brain not to function normally. You experience symptoms ranging from headache, dizziness or nausea to feeling confused or out of it. A “mild” concussion is one that is not life-threatening but typically requires a doctor’s care.

So if you took a small hit to the head and had any concussion symptoms, you should leave the activity right away. You should then have a doctor examine you to rule out a concussion. (We would consider it a concussion until proven otherwise.)

A subconcussive blow is one rung below a mild concussion. You get hit in the head but you don’t experience symptoms. In this case, we would not suspect a concussion (but symptoms can come on hours after hit, so monitor closely). However, this minor blow may still cause damage over time. We would be naïve to think there’s not some force that’s transmitted to the brain from these milder hits. We simply don’t know enough about these milder hits to definitively say how dangerous they are.

Q: Are subconcussive impacts dangerous?

A: There have been studies on accelerometers (a device which measures acceleration) and helmets, but the data is difficult to interpret because:

  • The force that hits the helmet doesn’t get transmitted all the way to the brain, so it’s hard to measure completely.
  • For studies involving athletes with no symptoms, we can’t be sure they’re telling the truth about the lack of symptoms or if their trauma is worth noting. So we don’t know how many subconcussive hits are potentially problematic down the road.
  • We don’t know what effect, if any, these hits have on the brain over time. The literature’s not there to support a conclusive answer.

I’ve had situations where athletes — who often sustain blows to their heads — have gotten concussions from a small unexpected hit on the back of the head. While soccer and football players often develop neck strength that may absorb smaller blows, if they receive a hit they’re not ready for, they can be out for two or more weeks with a concussion because they never had time to prepare for that unexpected hit.


Q: Are mild head injuries more dangerous for younger people than older people?

A: While the younger brain may heal faster, we also know that the developing brain in younger people is probably more irritated by subtle blows to the head. As athletes get older, we think the brain can withstand a little more force.

Plus, younger people may not report concussion symptoms because they don’t know they’re having them. Children are notorious for not being able to explain what a headache is or exactly how they’re feeling. So we can’t definitively say that the younger athlete can sustain these minor blows without any significant repercussions.

The takeaway is we need to protect younger athletes:

  • Limit blows to the head as their brains develop (perhaps through strict tackling guidelines and enforcing proper techniques).
  • Educate them about concussion symptoms.
  • Children and young teens need to know when to tell somebody so they can pull themselves off the field right away and recover. The best treatment is prevention and education. Make sure everyone, the athlete, teammates, coaches and parents are aware of the symptoms of concussion.

Q: When should you see your doctor about a head trauma?

A: You should visit an emergency room if you experience serious symptoms, such as:

  • Decrease in mental status or neurological function.
  • Numbness or tingling.
  • Worsening headache.
  • Prolonged loss of consciousness.
  • Repetitive vomiting.
  • Significant neck pain.
  • Vision loss.

Follow up with your doctor about hits to the head that cause both major and minor concussion symptoms. More minor symptoms include:

  • Dizziness.
  • Feeling foggy.
  • Light sensitivity.
  • Noise sensitivity.
  • Headache.
  • Head pressure.
  • Trouble concentrating or remembering.

But pay attention to anything that would make someone stop play and not be able to continue for even a short time. The motto is “When in doubt, sit them out.” Remember: It’s safer to err on the side of caution. Even if you don’t experience concussion symptoms, call your doctor if you have any concerns following a subconcussive impact.

Physician visits are especially important for athletes that sustained concussions because we need to ensure their health before they return to play. We can work with them on symptom reduction faster than they could on their own. We also offer guidelines about how to:

  • Manage symptoms.
  • Return to play safely and effectively.
  • Return to the classroom effectively and with fewer symptoms.
  • Recover completely.

And we emphasize concussion education. We help you recognize the signs of a concussion so you can pull yourself out of play sooner. You’ll recover faster than someone who stays in the game with concussion symptoms.


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