脑震荡是一种常见而较轻微的脑部创伤病症，指病人因为意外或头部被猛烈撞击使脑部受震而引发的综合症。其特点为短暂的失忆，清醒后常有头疼、恶心、呕吐等症状，但无任何神经系统缺损。

**亦有文献把 “Brainstorming” 译成“脑震荡”，但“Brainstorming”更普遍的译名为脑力激荡法，又称头脑风暴。

Concussion, from the Latin concutere ("to shake violently") or concussus ("action of striking together"), is the most common type of traumatic brain injury. The terms mild brain injury, mild traumatic brain injury (MTBI), mild head injury (MHI), minor head trauma, and concussion may be used interchangeably, although the last is often treated as a narrower category. Although the term "concussion" is still used in sports literature as interchangeable with "MHI" or "MTBI", the general clinical medical literature now uses "MTBI" instead. In this article, "concussion" and "MTBI" are used interchangeably. Frequently defined as a head injury with a temporary loss of brain function, concussion causes a variety of physical, cognitive, and emotional symptoms, which may not be recognized if subtle.