Some experts believe post-concussion symptoms are caused by structural damage to the brain or disruption of neurotransmitter systems, resulting from the impact that caused the concussion.

Others believe post-concussion symptoms are related to psychological factors, especially since the most common symptoms — headache, dizziness and sleep problems — are similar to those often experienced by people diagnosed with depression, anxiety or post-traumatic stress disorder.

In many cases, both physiological effects of brain trauma and emotional reactions to these effects play a role in the development of symptoms.

Researchers haven't determined why some people who've had concussions develop persistent post-concussion symptoms while others do not. No proven correlation between the severity of the injury and the likelihood of developing persistent post-concussion symptoms exists.

Aug. 19, 2014

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