When it gets hot, millions of people see their feet and ankles swell and feel heavy legs by the end of the day. It's not just an impression: heat acts directly on your circulation. Here's why heat makes your feet, ankles and legs swell — and, above all, what to do to reduce the swelling fast, from a simple habit to lymphatic drainage at home.
- Heat strongly dilates the blood vessels and sends much more blood to the skin to release heat, which slows venous return → feet, ankles and legs swell: a "heat edema"1.
- What to do: hydration (1.5–2 L/day), elevate the legs, cool water on the legs, walking, less salt.
- To deflate quickly in the evening: a lymphatic drainage session at home (pressotherapy) of 20–30 min.
- See a doctor if the swelling is sudden, painful, in a single leg, red or warm.
Why do feet and ankles swell in the heat?
Quick answer: to cool down, the body dilates the veins and sends blood to the skin; this blood then flows back to the heart less efficiently and fluid builds up in the feet and ankles.
It's a thermoregulation mechanism: in the heat, the body dilates the vessels to send more blood to the skin — and nearly all (~90%) of this extra blood flow to the skin comes from this active vessel dilation1. The dilated leg veins then struggle to push blood back up against gravity, so it pools in the lower body.
Heavy legs, swollen feet: who is most affected?
Quick answer: anyone can be affected, but especially people who stand all day, those going through menopause, travellers (immobility), or anyone with known venous insufficiency.
- Jobs on your feet (nurses, retail, hairdressing): standing + heat = legs like concrete by evening.
- Menopause and hormonal changes: water retention is more pronounced, and heat amplifies it.
- Travel (plane, car, train): immobility + heat make the ankles swell.
- Known venous insufficiency: heat temporarily worsens the heaviness.
What to do for swollen feet and ankles? A day-by-day routine
Quick answer: move and hydrate in the morning, stay cool and keep moving during the day, then deflate in the evening (cool water + legs elevated + drainage).
Move and hydrate early.
A 20–30 min walk in the cool to activate the calf pump. Start hydrating on waking — aim for 1.5 to 2 L over the day.
Stay cool and keep moving.
Avoid standing still; do ankle flexes every hour. Cool room, water regularly, limit salt.
Cool + drainage.
A jet of cool water from ankle to knee, legs elevated for 20 min, then a pressotherapy session to boost drainage.
5 days to lighter legs in the heat.
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How to deflate legs and ankles quickly in the evening?
Quick answer: elevate the legs for 20 min, run cool water over them, then do a 20–30 min pressotherapy session. Pneumatic compression reduces venous edema, all the more so when the pressure is well-suited2.
Pressotherapy reproduces the principle of lymphatic drainage at home: boots apply rhythmic pressure, from foot to thigh, to support venous and lymphatic return. The key thing to look for: air chambers that inflate in sequence and overlap, for continuous compression with no "gap" on the way up — and an adjustable pressure (the Restex Recovery boots range from 80 to 260 mmHg, letting you adapt the intensity to your comfort).
"I was looking for an alternative to drainage at a clinic. Within two weeks my ankles had visibly deflated. So much more practical than booking appointments." — Sandrine, verified review ★★★★★
"After 12 hours on my feet at the hospital, I came home with legs like concrete. Since the Restex, my legs are so much lighter the next day. It's become my evening ritual." — Marie K., verified review ★★★★★
Clinic or home: the maths
| Criterion | Clinic | At home (Restex) |
|---|---|---|
| Cost | ~€70–80/session | One-off investment, unlimited |
| Availability | By appointment | Whenever you want, in the evening |
| Pressure | Variable | Adjustable 80–260 mmHg |
| Comfort in heat | Travelling in the heatwave | At home, in the cool |
At ~€70 a clinic session, the device pays for itself in about 8 sessions — after that, it's unlimited.
"I used to spend €70 a session at my physio. After 8 sessions my Restex had paid for themselves. Now I do a session whenever I want, on my sofa." — Caroline, verified review ★★★★★
What NOT to do in the heat
Quick answer: avoid heat on the legs (hot showers), prolonged immobility, under-hydration and excess salt.
- Hot showers and baths on the legs: heat dilates the veins even more. Go for lukewarm to cool.
- Staying still for long periods, standing or sitting with legs crossed.
- Skipping hydration thinking "drink less = swell less": it's the opposite.
- Too much salt or alcohol, which worsen water retention.
How to use pressotherapy during a heatwave?
Quick answer: in the evening, in the cool, a 20–30 min session at moderate pressure (a "drainage" programme), then hydrate.
Start gently the first few days, then adjust to your comfort. One session a day during heat peaks makes a real difference. Full protocol: lymphatic drainage at home.
When should you see a doctor?
Frequently asked questions
Why do my feet and ankles swell when it's hot?
Heat dilates the veins and slows the return of blood to the heart: fluid builds up in the feet and ankles (heat edema). It's common and usually temporary.
What to do for ankles swollen by the heat?
Cool water from ankle to knee, legs elevated for 20 min, hydration, walking, and a pressotherapy session in the evening to deflate.
How to deflate the legs quickly in the evening?
Elevation for 20 min, cool, and a 20–30 min lymphatic drainage session at home (pressotherapy) boost circulation and relieve the heaviness.
Why do my legs swell more during menopause when it's hot?
Hormonal changes increase water retention, and heat amplifies it. Anti-retention habits and drainage at home help.
What pressure should I choose for legs swollen by the heat?
Start between 80 and 120 mmHg for gentle drainage, then adjust. A well-suited pressure reduces edema more; the Restex boots adjust from 80 to 260 mmHg.
Should I worry about an ankle swollen by the heat?
Swelling of both ankles from the heat is generally benign. Swelling of a single leg that is painful, red or warm should prompt you to seek medical advice without delay.
Don't let the heat weigh down your days
Between good habits and a drainage session at home, you can get back to light legs, even in the middle of a heatwave.
👉 Discover the Restex Recovery pressotherapy boots. Also read: swollen legs in the evening, what to do.
- Charkoudian N. Mechanisms and modifiers of reflex induced cutaneous vasodilation and vasoconstriction in humans. J Appl Physiol. 2010.
- Vanscheidt W, Ukat A, Partsch H. Dose-response of compression therapy for chronic venous edema — higher pressures are associated with greater volume reduction: two randomized clinical studies. J Vasc Surg. 2009;49(2):395-402.
- Assurance Maladie — Heavy legs and venous insufficiency (ameli.fr).
- Santé publique France — Extreme heat and heatwaves: effects on the body.
Bottes Restex Recovery.
Les techniques décrites dans cet article — 6 chambres chevauchantes, compression séquentielle, 30 minutes depuis votre canapé.
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