Concussion Symptoms

by Steve Holder on June 25, 2008

Concussion is by far the most common type of brain injury. It is comparatively minor and the brain typically heals without specific treatment within a few weeks or months provided there is no re-injury.

As comforting as that might sound to someone who’s suffered a head injury, it doesn’t really answer the questions “Was it just a concussion?” and “How can I be sure it’s not something worse?”

Was It Just a Concussion?

When the brain strikes the interior of the skull because of a blow to the head or a violent head movement, brain function is disrupted. Researchers are still trying to understand exactly what happens in a concussion, but current belief is that concussion symptoms can appear without any apparent physical damage to the brain.

Concussion symptoms are similar to the symptoms of many other diseases, injuries and psychological problems so there can be some risk of misdiagnosis by attributing the symptoms of some other illness to being the result of a minor head injury.

Nonetheless, doctors have a routine list of common symptoms that occur following a concussion. Not all of these symptoms occur, and the symptoms experienced may vary depending on the location and severity of the injury. Physical symptoms commonly appear soon afterward, while changes in mood or mental function may not be apparent until days later.

Physical Symptoms

  • Loss of consciousness immediately following the injury
  • Headache, nausea, or vomiting
  • Dizziness, difficulty with balance
  • Drowsiness or insomnia
  • Weakness, fatigue
  • Double or blurred vision, or sensitivity to light
  • Ringing in the ears or decreased hearing ability
  • Decreased ability to taste or smell

Cognitive (Mental) Symptoms

  • No memory of events immediately before or after the injury
  • Difficulty concentrating
  • Repeatedly asking the same question
  • Confusion
  • Slow thinking
  • Poor judgment
  • Poor work performance

Emotional Symptoms

  • Irritability, anxiety, or restlessness
  • Depression
  • Mood swings
  • Decreased sex drive

How Can I Be Sure It’s Not Something Worse?

If you have any doubt as to the severity of the injury, see a doctor. Physicians will very likely rely on the Canadian Head CT Rule to evaluate whether a CT scan is advisable to diagnose a more serious traumatic brain injury. Following this rule, the doctor classifies the injured person as high risk, medium risk or low risk.

High Risk

Medium Risk

  • Amnesia of longer than 30 minutes
  • The injury occurred from a vehicle accident, being ejected from a vehicle, or a fall from a height greater than 3 feet

Those in the high and moderate risk categories get CT scans. Those not in the high or medium risk category are sent home with instructions to come back if symptoms change or worsen.

Related Articles

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{ 3 comments… read them below or add one }

Medical Symptoms Search July 30, 2008 at 4:52 am

Thx for this man. I am a big fan of your blog and all of your entries. I am a student who spends a lot of time online and your site is one of the best!

Dr Tahir February 11, 2009 at 3:41 pm

I am working psychologist. This website is wonder full effort, it made me wise about my case of mild head injury (Blow by fall on ground which cause left forehead swollen), which was labeled as case of depression and mood disorder by psychiatrist. He exactly recovered after few weeks


Steve Holder February 12, 2009 at 3:58 pm

Dr. Tahir,

We’re pleased you found this article helpful in your circumstances and we’re happy for your recovery.

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