It is estimated that as many as 1.6–3.8 million concussions occur in the US per year in competitive<unk> s and recreational activities; this is a rough estimate, since as many as 50% of concussions go unreported. Concussions occur in all<unk> s with the highest incidence in American football, ice hockey, rugby, soccer, and basketball. In addition to concussions caused by a single severe impact, multiple minor impacts may also cause brain injury. Less than 10% of cases experience a loss of consciousness, and many typical symptoms appear after the initial concussion evaluation. The overall incidence risk of concussion is higher in adults than in youth, as the injury rate per 1,000 athletic exposures for youth is 0.23, compared to 0.28 in collegiate athletes. An analysis of National Collegiate Athletic Association (NCAA) injury reports estimated concussion rates among student athletes who participate in NCAA<unk> s during the 2011–2012 through 2014–2015 academic years:<unk>  Rates per 1000 Athlete-Exposures (95% Confidence Interval) Overall Competition Practice Men's Baseball 0.09 0.16 0.04 Basketball 0.38 0.53 0.34 Football 0.75 3.25 0.48 Ice hockey 0.74 2.40 0.20 Lacrosse 0.30 0.91 0.19 Soccer 0.26 0.67 0.14 Wrestling 0.89 4.31 0.48 Women's Basketball 0.53 1.00 0.39 Ice hockey 0.78 2.11 0.31 Lacrosse 0.45 1.28 0.25 Soccer 0.54 1.65 0.18 Softball 0.26 0.42 0.18 Volleyball 0.37 0.64 0.27
Concussions in sport
Concussions in rugby union
Suicide by jumping from height
Mushroom poisoning
Bad trip
Illness and injuries during spaceflight
Skin conditions in instrumental musicians
Bee sting