How High Atmospheric Pressure Affects the Body — and Who Should Pay Closer Attention on Sunny Days

An anticyclone on a weather map means clear skies, calm air, and sun. Sounds like the perfect day. But it's precisely during this cloudless, still weather that some people develop headaches, blood pressure spikes, and an unexplainable wave of weakness.

It's easy to blame rain and gray skies for everything, as if overcast weather were the root of all discomfort. But cardiologists and general practitioners know the pattern often runs the opposite way: spikes in patients reporting poor health frequently coincide not with storm systems, but with sustained anticyclones, when the barometer climbs and stays high for days. Let's break down why this happens, and what to do about it.

What High Atmospheric Pressure Actually Is

Normal atmospheric pressure at sea level is considered to be 760 mmHg. In practice, it fluctuates constantly: cyclones bring lower pressure (clouds, rain, wind), while anticyclones bring higher pressure (clear skies, no wind, dry air).

When pressure climbs to 770–780 mmHg and holds there for several days, that's the sustained anticyclone during which some people start feeling worse. The paradox is that the weather outside looks flawless: sun, blue sky, not a cloud in sight.

Why the Body Responds to the Barometer

Blood pressure inside the vessels and atmospheric pressure outside are directly linked. Healthy blood vessels adjust automatically to these shifts — constricting or dilating to maintain balance. A person doesn't even notice it happening.

Polina Zhelezova, the Kostroma region health department's lead specialist in medical prevention, explains that problems begin when blood vessels are weakened or can't adapt quickly enough — in people with chronic cardiovascular conditions, after prolonged stress, or amid a lack of sleep or physical activity. In these cases, the body reacts to something a healthy person simply wouldn't notice.

What Weather-Sensitive People Actually Feel During an Anticyclone

The set of symptoms tends to follow a fairly consistent pattern:

• Rising blood pressure — blood vessels constrict as atmospheric pressure climbs, and in people with hypertension, readings on a monitor can jump by 10–20 points.
• A pressing, bursting headache, often centered in the back of the head and temples.
• Weakness and drowsiness — under high atmospheric pressure, air becomes denser, yet oxygen concentration per unit of volume doesn't rise proportionally, contrary to what you might expect — breathing can subjectively feel harder.
• Ringing in the ears and dizziness, especially when standing up quickly from a lying position.
• Irritability and anxiety, without any obvious external cause.

Important note: none of these symptoms are unique to an anticyclone — they can accompany dozens of other conditions. But if they show up specifically during calm, sunny weather and fade once a storm system moves in, a link to pressure is plausible.

Who's at Higher Risk

Four groups of people feel the effects of an anticyclone most acutely.

• People with hypertension

Elevated atmospheric pressure can trigger a further rise in blood pressure.

Oksana Pivovarova, professor in the therapy department at Moscow Region State University, recommends measuring blood pressure 2–3 times a day during these stretches and taking prescribed medication once readings exceed 140/90, rather than waiting for symptoms to worsen.

• People with heart conditions

During an anticyclone, strain on the cardiovascular system increases: blood vessels constrict, forcing the heart to work against greater resistance.

• People with asthma and allergies

The stillness that comes with an anticyclone means air over a city stays put: exhaust, dust, pollen, and industrial emissions don't disperse — they accumulate in the surface layer. For people with respiratory issues, this can matter more than the pressure itself.

• Older adults

With age, blood vessels lose elasticity and adapt more slowly to pressure changes. The response to an anticyclone runs noticeably stronger in people over 60.

What Science Actually Says

Weather sensitivity is one of the more contested topics in medicine. Large-scale studies haven't found a definitive causal link between atmospheric pressure changes and headache episodes.

A year-long observation of 100 migraine patients, tracking pressure, humidity, and temperature every four hours, found no reliable correlation.

That doesn't mean people are imagining their symptoms. The mechanism is likely more complex than "pressure rose, so the head started hurting": well-being depends not on a single barometer reading, but on a combination of factors — how sharp the shift was, how long it lasted, humidity, air quality, and a specific person's baseline health.

What Helps During High Atmospheric Pressure

There's no specific "anticyclone pill," but a few habits reduce discomfort on these days.

• Water. The dry air that accompanies an anticyclone quietly dehydrates the body. Two extra glasses of water over the course of the day is the simplest countermeasure.
• Morning activity instead of evening. Atmospheric pressure typically peaks in the middle and later part of the day. Shift a walk or run to the morning, before the shift reaches its maximum.
• Ventilation. With no wind outside, indoor air stagnates faster than usual. A brief cross-breeze every couple of hours noticeably improves how you feel, especially in a city apartment.
• Reduced exertion. Pivovarova recommends avoiding intense workouts and extended sun exposure during anticyclone days — overheating combined with high pressure adds extra strain on the heart.

When an Anticyclone Lingers

An anticyclone that holds for a week or more creates an additional problem: inversion. Warm air aloft traps cold air near the surface, and pollutants can't rise and disperse. In major cities, this leads to smog — the same phenomenon Moscow experienced in summer 2010, when a blocking anticyclone refused to move for two months.

For weather-sensitive people, a prolonged anticyclone is the worst-case scenario: no wind, no pressure relief, no weather change. The one consolation is that an anticyclone always ends eventually. Sooner or later, a cyclone moves in with rain, wind, and cloud cover — and for anyone who struggles with high pressure, that shift is, quite literally, a relief.