Öz
In American football, rugby, boxing, kickboxing (K1) and contact sports similar to these sports, the risk of concussion is high due to blows and collisions. There is limited information about the concussions that occur, the risks and treatment methods. The aim of the study is to examine the causes and consequences of concussion, the effects in some sports and the rates of injury, and to present a review about the researches. In the study, using PubMed, Google Scholar, Ankara and Kırıkkale University databases, Ebscohost database; ''concussion'', or ''concussion syndrome'', ''American football'', or'' American football and concussion'', ''Rugby'', or ''Rugby and concussion'', ''kick boxing'', or ''kick boxing and concussion'', or ''boxing'', or ''boxing and concussion'' have been searched with primary search terms. Reference lists of the defined literature were also examined; the studies were thoroughly reviewed after critical analysis and bias assessment to validate the inclusion criteria. The studies were evaluated under the headings of field performance and return to play, physical function, cognitive impairment, memory impairment, reaction time, tests and treatments. During the field performance and return to the game, most of the players who had a shock survived and returned to the game at different times; that there are significant relationships between shaking and physical functionality in studies on physical function; in cognitive impairment studies, cognitive impairment and depression were found in people with concussion. Significant relationships were found between memory impairment, reaction time and shaking. After the tests and treatments performed, improvement in the vestibular system, improvement in cerebral blood flow and volume, increase in cognitive scores and motor skills and decrease in symptoms were observed. In all sports branches where there is a risk of concussion, athletes and trainers should consider the risks associated with concussion.