Persistent Postural-Perceptual Dizziness.
You are not imagining this.

PPPD (Persistent Postural-Perceptual Dizziness) is a chronic vestibular condition characterised by dizziness, unsteadiness, or a non-spinning sensation of swaying or rocking. To meet the diagnostic criteria, symptoms are present on most days for three months or more.

Symptoms tend to worsen with upright posture, active or passive motion, and exposure to complex visual environments: grocery store aisles, scrolling on a phone, traffic, crowds, patterned floors, fluorescent lighting. Symptoms often ease when you lie down, and rarely disappear for long.

PPPD almost always follows something that disrupted the balance system, even briefly. Common precipitants include BPPV, vestibular neuritis, a concussion, a bout of labyrinthitis, a severe panic attack, or a significant medical illness.

The original event usually resolves on its own or responds to treatment. What remains is a set of adaptations the nervous system made during the acute phase, which were helpful at the time and have now overstayed their welcome. The trigger heals. The pattern persists.

PPPD is a clinical diagnosis. Vestibular function tests, MRIs, and bloodwork typically come back without abnormalities, which is frustrating and also expected. The Bárány Society established the criteria in 2017, and the condition is listed in the ICD-11.

The absence of findings on testing is not evidence that nothing is wrong. It is consistent with the nature of PPPD, which lives in how the brain processes signals from an otherwise functional balance system, not in the hardware itself.

Three processes tend to work together in PPPD, each one feeding the next. Threat-detection circuits stay elevated, so the nervous system treats normal postural shifts as potential danger. The brain over-weights visual input as it tries to stabilise balance, which is why busy visual scenes feel overwhelming. Attention gets locked onto internal sensation, which makes every small sway feel loud.

The loop is maintained by the exact things that feel like common sense: hyper-vigilance about movement, avoidance of triggering environments, and the understandable habit of scanning the body for symptoms. Each of these are targetable in therapy.

Recovery from PPPD is real, and the evidence base supports a multi-modal approach: vestibular rehabilitation to gently retrain the balance system, CBT to address the thought and attention patterns that maintain the loop, and, in some cases, medication prescribed by a physician (SSRIs and SNRIs have the strongest evidence).

Outcomes are meaningfully better when the condition is named early and addressed from multiple angles. Not every day becomes symptom-free, but the relationship with symptoms changes, and the ground under your feet starts to feel like ground again.