Triggers & mechanism

PPPD almost always begins with a real event that causes dizziness — a bout of vertigo from an inner-ear problem, a migraine, a panic attack, or a head or neck injury. During that scary episode, the body sensibly becomes very careful and relies heavily on vision to stay balanced. In PPPD, the brain keeps using that cautious setting long after the original problem has gone.

Onset is linked to a precipitating event — most often a peripheral vestibular disorder (vestibular neuritis, BPPV), vestibular migraine, an acute panic/anxiety episode, or whiplash/concussion.1 The acute problem resolves, but the dizziness persists — PPPD is what is left behind.

The trigger need not be vestibular: any event that provokes acute dizziness or a strong threat response can do it, and pre-existing anxious or introspective traits raise the risk. PPPD also frequently co-exists with its trigger — particularly vestibular migraine — which is why both often need treating together.2

Three things keep it going: a stiff, over-careful way of standing and walking; over-reliance on vision, so busy scenes feel disorientating; and worry and watchfulness about the dizziness, which makes the brain notice it even more. Together these form a self-sustaining loop.

Three interacting processes perpetuate PPPD: a retained high-risk postural-control strategy (stiffening, over-reliance on ankle strategy); increased visual dependence, producing visual vertigo and space-and-motion discomfort; and hypervigilant self-monitoring of balance and threat.1

Functional-imaging work supports a shift toward visual and away from vestibular weighting, with altered activity in visuo-vestibular cortical areas and anxiety-related networks — a “software” reconfiguration rather than structural damage.3 Framing it this way for the patient is itself therapeutic and sets up rehabilitation, which works precisely by re-training these maladaptive strategies.