Updated:
by
Lauren Wikholm, MD
Medically reviewed by Lauren Wikholm, MD
If your legs feel heavier, look more swollen, or your skin turns red and itchy once summer heat sets in, you are not imagining it. For people living with vein and lymphatic problems, hot weather can turn a manageable condition into a daily struggle. Two problems in particular tend to flare in the heat: phlebolymphedema, a mix of vein and lymphatic swelling, and stasis dermatitis, a skin problem caused by long-term pressure in the leg veins.
In this blog, we will review what happens beneath your skin when temperatures soar and legs swell—and what you can do to stay comfortable all summer long.
When you get hot, your body cools itself by widening the blood vessels near your skin. This process is called vasodilation, and according to the Cleveland Clinic, the process sends more blood to the surface to release heat. It also pushes more fluid out of your tiny blood vessels and into the surrounding tissue. Healthy veins and lymph vessels clear that extra fluid without any trouble.
But if your legs are already struggling, the fluid has nowhere to go. Gravity pulls it down to the lowest point in your body, which is your feet and ankles. The result is swelling, heaviness, and aching that often feels worse at the end of the day or after standing for a while.
Heat does not cause vein disease, but it can make an existing problem much harder to manage. Conditions such as chronic venous insufficiency (CVI), where the valves in your leg veins no longer close the way they should, tend to feel worse in the summer for exactly this reason.
Your body has two drainage systems working together in your legs. Your veins carry blood back up to your heart, and your lymphatic system clears the extra fluid that collects between your cells. When one system falls behind, the other tries to pick up the slack.
In chronic venous insufficiency, leaky valves allow blood to pool in the legs and increase pressure within the veins. That pressure forces more fluid into the tissue. At first, the lymphatic system keeps up. Over time, though, it gets overloaded and starts to fail too.
When both systems break down together, the result is phlebolymphedema. It is actually the most common cause of secondary lymphedema in the United States, according to the American Venous Forum. One review published by PubMed Central found it accounted for about 42 percent of lower-limb lymphedema cases. Even though it is common, it often goes under-recognized and undertreated.
Summer heat adds even more fluid to a system that is already at its limit, which is why swelling can rise quickly on a hot day.
When high pressure builds in your leg veins for a long time, it can cause inflammation of the skin, usually around the inner ankle. This is stasis dermatitis, and it is often the earliest skin sign of chronic venous insufficiency. Early on, you might notice redness, itching, dryness, flaking, or a brown, rust-colored discoloration on your lower legs.
Left untreated, these skin changes can progress. Stasis dermatitis is a warning sign that can precede venous leg ulcers, which are open sores that are slow to heal. Summer makes this trickier. Itchy, irritated skin invites scratching, and sweat trapped under clothing can lead to skin breakdown and increase the risk of infection. Protecting the skin barrier matters just as much as controlling the swelling.
If your legs swell, ache, or develop itchy, discolored skin every summer, that is your body signaling an underlying vein or lymphatic problem worth evaluating. As the nation's largest physician-led vein care practice, CVR offers expert evaluation in a comfortable outpatient setting.
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Lauren Wikholm, MD, a board-certified vein specialist at Center for Vein Restoration’s vein center in Vancouver, Washington, shares the practical advice she gives patients who are heading into the warmer months.
1. Do Not Skip Compression Completely:
"Do not skip compression completely. Even a few hours in the cooler morning hours can help." - Lauren Wikholm, MD
Compression is the backbone of managing both vein and lymphatic swelling. It gently squeezes your legs to help push fluid up and out instead of letting it settle. It is tempting to abandon your stockings when it is hot, but going without them lets the swelling win. Your legs usually have the least swelling first thing in the morning, according to Yale Medicine, so that is the best time to put compression on, before fluid has a chance to build up. Even wearing them through the cooler morning hours gives your legs real support.
If heat makes them uncomfortable, ask your CVR specialist about lighter, breathable, moisture-wicking graduated garments made for warm weather.
2. Use Water as Compression:
"Use water as compression. If you are standing in a swimming pool in 4 feet of water, this is also good leg compression due to the pressure of the water." - Lauren Wikholm, MD
This one employs clever physics. Water pressure increases the deeper you go, so when you stand in a pool, the water presses hardest on your feet and ankles and eases off higher up your legs. That is the exact same pattern as a graduated compression stocking, which is tightest at the ankle. Standing in about four feet of water wraps your lower legs in natural, head-to-toe pressure. Research reported in the Journal of Vascular Surgery on water-based therapy shows that hydrostatic pressure can help move fluid and reduce limb swelling, and the effect depends on how deep you stand, so hip- or chest-deep water works better than shallow water, per Sage Journals.
One important caution: use a cool or comfortable pool, not a hot tub. Hot water triggers the same vasodilation that worsens summer swelling, which would cancel out the benefit. A cool pool gives you compression and cooling at the same time. Think of water as a helpful add-on, not a replacement for the compression your specialist has prescribed.
3. Elevate:
"Elevate for 30 to 60 minutes above your heart consistently each day." - Lauren Wikholm, MD
Raising your legs above the level of your heart lets gravity work for you rather than against you, draining pooled fluid back toward your chest and reducing pressure in your veins. Major medical references agree on the dose: elevate your legs above heart level for 30 minutes or longer, at least three times a day. Research published in PubMed Central shows this simple habit improves circulation in the skin, helps ulcers heal, and reduces swelling.
The keyword is consistency! Even one solid 30- to 60-minute session a day makes a difference, and doing it more often helps even more.
Because stasis dermatitis can crack the skin, and summer raises the odds of infection, it helps to know the warning signs that need prompt attention. Call your doctor or seek same-day care if you notice:
These can be signs of cellulitis, a skin infection that spreads quickly and needs fast treatment. Wearing compression consistently actually helps prevent these infections. Sudden swelling and pain in one leg can also point to a blood clot, which is a medical emergency. When in doubt, get it checked.
Summer swelling and skin changes are not something you simply have to endure. Phlebolymphedema and stasis dermatitis are progressive, meaning they tend to worsen without treatment, but they also respond well to early treatment.
As the nation's largest physician-led vein care practice, with board-certified specialists at more than 130 locations nationwide, Center for Vein Restoration can identify the root cause of your swelling and develop a plan that fits your life.
Q: Does hot weather cause vein disease?
A: No, heat does not cause vein or lymphatic disease. It can, however, make an existing condition feel much worse by widening your blood vessels and pushing more fluid into your
Q: Can I still swim if I have leg swelling?
A: Yes, and a cool pool can actually help. The water's pressure acts like a natural compression garment while keeping your legs cool.
Q: Are compression stockings safe to wear in summer?
A: Yes, and skipping them tends to make summer swelling worse. Put them on in the morning when swelling is lowest, and ask about lighter, breathable fabrics if heat is a problem.
Q: How long should I elevate my legs each day?
A: Aim for 30 to 60 minutes above heart level, at least once a day, done consistently. Elevating more often, up to three times a day, provides even more benefit.
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