You need to lose consciousness (pass out) to sustain a concussion

Concussions can occur with or without loss of consciousness. The University of Pittsburgh Medical Center states that “more than 90 percent of concussions are not accompanied by a loss of consciousness.” Furthermore, a concussion accompanied by a loss of consciousness does not necessarily indicate it is a more severe concussion.

Concussions only occur when you get hit in the head

Concussions can occur from any hit, bump, movement, or collision that is forceful enough to rapidly shake the head back and forth. This means, for example, that someone can sustain a concussion when a blow to the body causes their head to move back and forth.

A concussion causes immediate symptoms and signs of injury

Concussion symptoms may not show up until hours or days after the initial injury.