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A concussion can result from a blow to the head which jars or otherwise impacts the brain. Brain function may be impaired temporarily, although a concussion does not always cause unconsciousness. Some of the symptoms and effects of a concussion are nausea, vision or equilibrium disturbances, confusion, and temporary amnesia.
"A diagram of the forces on the brain in concussion." by Patrick J. Lynch is licensed under CC BY
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References
Encyclopædia Britannica Online
N.d. concussion. http://www.britannica.com/EBchecked/topic/131340/concussion,
accessed October 15, 2014.
WebMD
N.d. Concussion (Traumatic Brain Injury).
http://www.webmd.com/brain/concussion-traumatic-brain-injury-symptoms-c…, accessed March 14, 2016.