Persistent postural-perceptual dizziness

The term persistent postural-perceptual dizziness (PPPD) is used to describe a commonly encountered type of dizziness that is not easily categorized into one of several other types, and for which the physical examination is typically normal. Patients with PPPD frequently initially suffer a sudden injury of some sort to their vestibular system, the neurologic network that preserves sense of balance.

Source: Wikipedia — Persistent postural-perceptual dizziness (CC BY-SA 4.0)