D2I2.
acute

Whiplash

Whiplash, whose formal term is whiplash associated disorders (WAD), is a range of injuries to the neck caused by or related to a sudden distortion of the neck associated with extension, although the exact injury mechanisms remain unknown. The term "whiplash" is a colloquialism. " acceleration–deceleration" (CAD) describes the mechanism of the injury, while WAD describes the subsequent injuries and symptoms.

Underlined words are explained — tap any of them.

Plain-language summary adapted from Wikipedia. Not medical advice.