A member asked:

How long after a head injury can a doctor tell if it was a concussion?

7 doctors weighed in across 3 answers

Could be a few days: Some symptoms of concussions may be immediate: like headache, vomiting or passing out or delayed in onset by hours or days after injury, such as: concentration and memory complaints, irritability and other personality changes, sensitivity to light and noise , sleep disturbances , psychological adjustment problems and depression, disorders of taste and smell.

Answered 2/1/2018

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Things changing: Newer modalities of imaging studies and even some lab testing are recently out which offer evidence for the presence of concussion or brain injury even when symptoms are no longer present. However, the gold standard of diagnosis still remains history by the patient and the identification of appropriate criteria.

Answered 12/1/2014

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Dr. Jeffrey Clemens answered

Specializes in General Surgery

Right away: Symptoms of a concussion would appear within a day or two at most. Its usually apparent right after the injury.

Answered 4/1/2019

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