Long COVID Atlas
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Plain-language first, with specialist detail below. For understanding, not medical advice.

Long COVID Atlas › Glossary › Labile blood pressure

Symptom

Labile blood pressure

https://longcovidatlas.org/glossary/labile-blood-pressure

In plain language

What it is

Blood pressure that swings suddenly and irregularly, sometimes surging high, sometimes dropping low.

Why it matters

It is a recognized feature of post-COVID dysautonomia and is often missed by a single office reading.

Think of it like

A pressure gauge that jumps around instead of holding a steady number.

Healthy: the baroreflex holds the line safe range small drifts get corrected within seconds Long COVID: the buffer fails same range, no longer held surge drop
Normally a fast reflex, the baroreflex, senses your blood pressure and corrects small drifts within seconds, holding it inside a narrow range. After COVID this buffer can fail, so the same pressure that used to stay level now swings, surging above the range and dropping below it. The swings are the failure of the control system, not a sign that you are doing something wrong.

For specialists

Formal definition

Large blood-pressure variability, including paroxysmal hypertension, sometimes with hypertension alternating with hypotension; among the more disabling features of post-viral dysautonomia.

Mechanism

Driven by autonomic dysfunction and baroreflex failure, with contributions from adrenergic and angiotensin-receptor autoantibodies and a vasoconstrictive ACE2 to angiotensin II shift.

Sources

Related terms

BaroreflexDysautonomiaPOTSEndothelial dysfunction