From The Clinician’s Bench

On the Gulf Coast, patients tell us the same thing every summer: they can feel a storm coming in their joints before it shows up on radar. They are not imagining it. When a tropical system lowers the barometric pressure around you, the tissues, joints, and fascia inside you respond — and if you live with hypermobility or osteoarthritis, you feel it more. Here is the physiology, the peer-reviewed evidence, and the four things that actually help: hydration, electrolytes, compression, and staying gently in motion.

Jacques Courseault, MD, CAQSM, FAAPMR · The Fascia Institute and Treatment Center®

01 · What Happens When A Tropical System Rolls In

Barometric (atmospheric) pressure is simply the weight of the air pressing on your body. It is always there — roughly 1,013 millibars at sea level on an average day — and your tissues are calibrated to it. Tropical depressions, tropical storms, and hurricanes are, by definition, large low-pressure systems. As one approaches the Gulf Coast, the barometer can fall quickly and steeply, often alongside a jump in humidity and wind. That combination — not just rain itself — is what many patients feel.

This is one of the better-studied questions in weather medicine. In the large “Cloudy with a Chance of Pain” study, more than 2,600 people with long-term pain conditions logged daily symptoms through a smartphone app while their local weather was tracked by GPS. Days with lower atmospheric pressure, higher humidity, and higher wind speed were associated with meaningfully more pain — on the worst weather days, the odds of a pain flare rose by about 20% versus an average day (Beukenhorst et al., npj Digital Medicine, 2019). An earlier clinical study in knee osteoarthritis likewise found that changes in barometric pressure and temperature independently influenced day-to-day joint pain (McAlindon et al., Am J Med, 2007).

02 · Why Low Pressure Reaches Into The Joint & The Fascia

The leading explanation is mechanical. Your joints, tendons, ligaments, and fascia normally sit in equilibrium with the air pressure around them. When that outside pressure drops, the balance tips outward: sealed structures like the joint capsule can expand ever so slightly — the same reason a sealed bag of chips puffs up as you drive into the mountains. In a healthy joint, that shift is imperceptible. In a joint that is already inflamed, worn, or wrapped in sensitized nerve endings, the same tiny expansion is enough to press on pain receptors and turn up the signal.

Fascia adds a second reason the change is felt. Fascia is not inert wrapping — it is a living, fluid-rich, sensor-dense tissue. Its ground substance is largely water held by molecules like hyaluronan, and that fluid is what lets fascial layers glide over one another and distribute load (Kirkness & Scarlata, Int J Mol Sci, 2026). A tissue this rich in fluid, and this densely wired with sensory nerve endings, is exactly the kind of tissue you would expect to register shifts in outside pressure and humidity. The mechanism is still being worked out — but the biology is coherent, and it lines up with what patients describe.

03 · Why Hypermobile Bodies Feel It More

We describe hypermobility to our patients as a Ferrari — a high-performance body type, not a defect — but one that is high-maintenance and becomes symptomatic when it is not cared for properly. If you have joint hypermobility, hypermobility spectrum disorder (HSD), or hypermobile Ehlers-Danlos syndrome (hEDS), your connective tissue is more elastic and your joints move through a larger range. That same laxity means a low-pressure day can nudge joints and soft tissue a little further than it would in a stiffer body.

But the bigger reason hypermobile patients get hit harder by tropical systems is that hypermobility rarely travels alone. It commonly overlaps with dysautonomia and postural orthostatic tachycardia syndrome (POTS), with mast cell activation, and with migraine — and every one of those systems is weather-sensitive. Many people with dysautonomia already run on low blood volume, so the fluid shifts and vasodilation that come with a hot, humid, low-pressure day can tip them into lightheadedness, racing heart, and fatigue on top of joint pain. Barometric swings are also a classic migraine trigger. So a storm front does not hit one system — it hits several at once. That is not fragility; it is a body doing a lot of regulating. Our Hypermobility & EDS Clinic is built specifically for this overlap.

04 · Why Osteoarthritic Joints Feel It More

Osteoarthritis changes the physics of a joint. Cartilage thins, the joint capsule and surrounding tissue carry low-grade inflammation, and the nerve endings around the joint become sensitized — primed to fire. When barometric pressure falls and the tissues around that joint expand slightly, the change is no longer imperceptible: it arrives at a joint that was already sending pain signals, and it amplifies them. This is consistent with the knee-osteoarthritis data showing that day-to-day pain tracks with barometric pressure and temperature (McAlindon et al., 2007).

The practical takeaway is that storm-day pain is a signal about the underlying joint, not just the weather. Weather you cannot change; the health of the joint you often can. At the clinic we address the joint itself with options such as orthobiologics and prolotherapy and shockwave therapy — so that the same front produces a smaller flare next season.

05 · Start With Hydration

Hydration is the first lever because it works on two of the systems a storm stresses. Fascia depends on its water content to glide and absorb load; when you are underhydrated, those sliding surfaces get stiffer and stickier. Your blood volume depends on water too — and for anyone with dysautonomia, going into a low-pressure, high-humidity day already dry is a recipe for a rough one. Hot, muggy pre-storm weather also pulls more fluid out of you through sweat, right when you need it most.

So the move is to hydrate ahead of the system, not to catch up once you already feel wrung out. Increase fluids in the day or two before a front arrives. But there is a catch that the next section solves: water alone only goes so far.

06 · Electrolytes & CoreSalt™

Here is the piece most people miss: drinking plain water when you are low on electrolytes does not reliably stay in the bloodstream where you need it. Water follows sodium. Sodium is what pulls fluid across the gut wall and holds it in the vascular space — the principle behind every oral rehydration solution. Without enough salt, a lot of what you drink is simply passed out again.

This matters most for the dysautonomia and POTS that so often accompany hypermobility. In a controlled study, a high-sodium diet expanded plasma (blood) volume, lowered the surge of stress hormones, and reduced the orthostatic tachycardia that leaves POTS patients dizzy and racing when they stand (Garland et al., JACC, 2021). Going into a storm with well-loaded fluid and salt gives your circulation a buffer against the day’s fluid shifts.

07 · Compression

Compression is the most direct answer to the physics of the problem. If falling atmospheric pressure lets tissues expand and blood pool, a compression garment supplies the counter-pressure the atmosphere took away. The strongest evidence is in POTS: in a randomized crossover trial, compression significantly reduced standing heart rate and symptoms, with full abdominal-plus-leg compression outperforming the legs alone — because the abdomen is where most blood pools when you stand (Bourne et al., JACC, 2021). For weather-sensitive dysautonomia, waist-high or abdominal compression is the highest-yield choice.

For an achy osteoarthritic or hypermobile joint, a compression sleeve helps in a different way: the snug input from the skin improves the joint’s sense of its own position (proprioception) and can improve comfort and function, even if it is not changing the joint itself (Bryk et al., knee osteoarthritis, 2011). The evidence here is more modest, but sleeves are low-cost and low-risk. The practical rule for both: put compression on early — before or as the front arrives — not after you are already flaring.

08 · Keep Moving

The instinct on a bad-weather day is to lie still, but that usually makes the next day worse. Gentle, continued movement does three useful things at once: it works fluid through your fascia so the layers keep gliding, it pumps blood back up out of your legs and abdomen (countering exactly the pooling that dysautonomia causes), and it keeps the muscles that stabilize your joints switched on.

It is also the single best-supported treatment for the underlying conditions. Exercise is first-line care for knee and hip osteoarthritis, with consistent evidence that it reduces pain and improves function (Cochrane review, knee osteoarthritis). And for hypermobility, targeted strengthening and proprioceptive work improves joint stability, pain, and quality of life (systematic review, 2023). The goal on a storm day is not a hard workout — it is to scale down, not stop: a walk, mobility work, gentle strengthening, whatever your body will accept.

09 · Your Simple Storm-Day Plan

1 – 2 days before

Load fluids and electrolytes early — don’t wait for symptoms. Take your CoreSalt™ as directed. Lay out compression garments so they’re within reach.

As the pressure falls

Compression on early (abdominal/waist-high for dysautonomia, sleeves for painful joints). Keep gently moving. Add warmth to stiff joints. Protect your sleep.

If you flare anyway

It’s real and it’s temporary. Keep hydrating with electrolytes, scale activity down rather than to zero, and bring the pattern to us so we can treat the underlying joint or system.

Research & References

1. Beukenhorst AL, Schultz DM, McBeth J, Sergeant JC, Dixon WG. How the weather affects the pain of citizen scientists using a smartphone app. npj Digital Medicine, 2019;2:105. PMID 31667359.
2. McAlindon T, Formica M, Schmid CH, Fletcher J. Changes in barometric pressure and ambient temperature influence osteoarthritis pain. American Journal of Medicine, 2007;120(5):429-434. PMID 17466654.
3. Wang L, Xu Q, Chen Y, Zhu Z, Cao Y. Associations between weather conditions and osteoarthritis pain: a systematic review and meta-analysis. Annals of Medicine, 2023;55(1):2196439. PMID 37078741.
4. Kirkness KB, Scarlata S. Understanding fascial tissue on the molecular level — how its unique properties enable adaptation or dysfunction. International Journal of Molecular Sciences, 2026;27(1):160.
5. Garland EM, Gamboa A, Nwazue VC, et al. Effect of high dietary sodium intake in patients with postural tachycardia syndrome. Journal of the American College of Cardiology, 2021;77(17):2174-2184.
6. Bourne KM, Sheldon RS, Hall J, et al. Compression garment reduces orthostatic tachycardia and symptoms in patients with postural orthostatic tachycardia syndrome. Journal of the American College of Cardiology, 2021;77(3):285-296.
7. Bryk FF, et al. Immediate effect of the elastic knee sleeve use on individuals with osteoarthritis. Revista Brasileira de Reumatologia, 2011;51(5):440-446. PMID 21952996.
8. Fransen M, McConnell S, Harmer AR, Van der Esch M, Simic M, Bennell KL. Exercise for osteoarthritis of the knee. Cochrane Database of Systematic Reviews, CD004376.
9. Reychler G, et al. Physical therapy interventions in generalized hypermobility spectrum disorder and hypermobile Ehlers-Danlos syndrome: a systematic review. 2023. PMID 37231592.

This reference list illustrates the literature behind each recommendation and is not exhaustive. The mechanism linking barometric pressure to joint and fascial pain remains an area of active study, and reported weather effects vary between individuals.