Compression Socks for Swelling: Swollen Ankles, Feet and Legs
Swollen ankles, feet and legs are common, especially at the end of a long day on your feet, after a flight, or in pregnancy. Compression socks are one of the simple things that can help, alongside raising your legs and keeping moving. But swelling has many causes, and a few of them need a doctor before any sock. This guide explains why legs swell, when to get help first, how compression socks help with swelling, and how to choose the pressure, the style and the size.
Why legs and ankles swell
Most swelling in the feet, ankles and legs comes from fluid building up in the tissues, which doctors call edema (oedema in the UK). MedlinePlus explains that gravity makes it most noticeable in the lower body, and that it can affect both legs and reach the calves or even the thighs (MedlinePlus, foot, leg and ankle swelling). The NHS says swelling often goes away on its own (NHS, swollen ankles, feet and legs).
Causes listed by the NHS and MedlinePlus include:
- Standing or sitting in the same position for too long, including long flights and car rides
- Eating a lot of salty food, or being overweight
- Pregnancy, and for some women parts of the menstrual cycle
- Some medicines, such as certain blood pressure medicines, hormones, steroids and some antidepressants
- Varicose veins, or veins that do not move blood back to the heart well (venous insufficiency)
Swelling can also come from an injury, an infection, a blood clot, or problems with the heart, kidneys or liver. Those causes are why the next section matters. MedlinePlus also says never to stop a medicine you think is causing swelling without talking to your doctor first.
When to get help first
Get medical advice the same day, before trying compression, if (NHS, MedlinePlus):
- The swelling is in one ankle, foot or leg and you do not know why, or it is new or getting worse in one leg only
- The swelling is severe, painful or started very suddenly
- The swollen area is red or feels hot, or you have a fever
- You also have swelling in your face or tummy
- You have diabetes and your feet, ankles or legs are swollen
- You have heart or kidney disease and the swelling is getting worse, or you have liver disease and now have swelling in your legs or abdomen
If you are pregnant and swelling suddenly increases, call your midwife or doctor immediately.
Swelling in one leg with pain, warmth or redness can be a deep vein thrombosis, a blood clot in the leg. A compression sock is not the answer to that, so get it checked first. The NHS also advises seeing a doctor if swelling in both legs has not improved after a few days of home care, or keeps getting worse.
How compression socks help with swelling
Graduated compression socks press hardest at the ankle and gradually less up the leg. MedlinePlus says compression stockings gently squeeze your legs to move blood up your legs, which helps prevent leg swelling (MedlinePlus, compression stockings). A review in the Canadian Medical Association Journal notes that graduated compression stockings are often used to treat chronic venous disease and edema, and that many studies reported improvement in symptoms such as pain and swelling (Lim and Davies, CMAJ 2014).
Compression may help with some leg swelling, including swelling associated with venous disease. Whether it is appropriate depends on the cause of the swelling and your circulation. It treats the swelling, not its cause, so if the swelling comes from a medicine, a heart or kidney problem or an injury, that cause still needs attention. Long-standing swelling from lymphoedema is treated differently: the CMAJ review describes a first phase of reducing the swelling, often with multilayer bandages, and stockings afterwards to keep it down.
If your swelling comes with visible varicose veins, our guide to compression stockings for varicose veins explains what stockings can and cannot do for the veins themselves.
Who should ask before wearing compression
Compression socks are generally safe, but not for every leg. The CMAJ review lists reasons not to use graduated compression stockings, including suspected or proven peripheral arterial disease, severe nerve damage or loss of feeling in the legs, allergy to the material, massive leg swelling or fluid on the lungs from heart failure, fragile or damaged skin, and a leg shape that prevents a correct fit (CMAJ 2014). Talk to your doctor before wearing firm compression if you have:
- Peripheral arterial disease or poor arterial circulation in the legs
- Severe numbness or reduced sensation in the feet or legs, as with some diabetic neuropathy
- Fragile or broken skin, dermatitis, or recent skin grafts on the leg
- Severe swelling caused by heart failure
The NHS also asks anyone with diabetes and swollen feet, ankles or legs to get an urgent appointment. The CMAJ review also lists severe nerve damage or reduced sensation as reasons compression needs clinical assessment.
Which pressure level for swelling
Start with the level your doctor or pharmacist suggests. The CMAJ review calls pressure under 20 mmHg low compression and 20-30 mmHg medium, while noting there is no single standard used worldwide. In the store's range:
The A107 sheer knee highs, for women.
Opaque, sheer and open toe knee highs, for women and men.
Firmer support. Talk to a clinician first, especially if the swelling is marked or comes with varicose veins.
Our guide to choosing a compression level and our explainer on what 20-30 mmHg means go into the numbers.
Which style for swollen ankles, feet or legs
Match the length to where the swelling sits:
The usual choice for swollen ankles and feet, since that is where fluid collects most.
Graduated compression styles with the toes, or the toes and heel, uncovered. Compare the stated mmHg range and fit; actual pressure depends on the garment and your leg. Our open toe guide compares them.
When swelling reaches the knees or thighs, in the level your clinician suggests.
Men's options include the A505M opaque 15-20 mmHg and the A511M open toe 20-30 mmHg knee highs, both in sizes Small to 7XL. For women who prefer an open toe, the A515W is 15-20 mmHg. Our open toe compression socks guide and thigh high stockings guide cover those styles in detail.
Getting the size right on swollen legs
Size matters more when legs swell. MedlinePlus advises putting stockings on first thing in the morning, before you get out of bed, because your legs are least swollen then (MedlinePlus). Measure your ankle and calf at that time too, and use the size chart on the product page. The CMAJ review notes that poorly fitting stockings can cause discomfort and, at worst, pressure damage to the skin, and that many problems are avoided by measuring and fitting properly.
Digging top bands, rolling, deep marks or wrinkles can indicate a fit problem. Cold, numb or tingling toes also need medical advice; do not assume that changing the size alone will solve them. Several of the store's knee highs, including the A505W, A501W and A911W, run up to 7XL, which helps wider calves. If socks cause pain or your toes become cold, numb or tingly, take them off and seek medical advice promptly. For other fit problems, ask a pharmacist or trained fitter to check the size and style before wearing them again.
Swelling in pregnancy
Some swelling in the legs, ankles and feet is normal in pregnancy. The NHS says it is often worse at the end of the day and later in pregnancy, and that swelling which comes on gradually is not usually harmful. A sudden increase in swelling in the face, hands or feet can be a sign of pre-eclampsia and needs a call to your midwife or doctor straight away (NHS, swelling in pregnancy).
The evidence on stockings for pregnancy swelling is mixed. The CMAJ review describes trials where stockings eased leg symptoms such as swelling, tiredness and pain, while a Cochrane review concluded that they do not appear to reduce leg swelling in pregnant women. If you want to try them, ask your midwife first. Our maternity compression guide covers what to ask.
Other ways to ease swelling
The NHS and MedlinePlus also suggest these habits to help ease swelling:
- Raise your legs on a chair or pillows when you can; lying down, raise them above the level of your heart.
- Get gentle exercise, like walking, to help move fluid back up the legs.
- Avoid standing or sitting still for long periods, and take breaks to move when travelling.
- Cut down on salty food.
- Wear wide, comfortable shoes with a low heel and soft sole, and avoid clothes, garters or ordinary socks that are tight around the legs.
- Wash, dry and moisturise your feet to avoid infections.
For swelling linked to long shifts or travel, our guides to compression for standing all day and compression socks for flying go further.
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FAQ
Do compression socks help with swelling?
They can help with everyday swelling in the ankles, feet and legs. MedlinePlus says compression stockings gently squeeze your legs to move blood up and help prevent leg swelling, and lists support stockings among the home-care tips for swollen legs. They ease the swelling, not its cause, so get swelling checked if it is new, one-sided, painful or getting worse.
What strength of compression socks is best for swollen ankles?
Ask your doctor or pharmacist. The store's socks come in 8-15, 15-20 and 20-30 mmHg, and 30-40 mmHg on a clinician's advice. The CMAJ review calls under 20 mmHg low compression and 20-30 mmHg medium.
Can compression socks make swelling worse?
A sock that is too tight or the wrong size can dig in at the top band and cause discomfort or skin damage. Measure your legs in the morning, follow the size chart, and take the socks off if they cause pain, numbness or deep marks. People with poor arterial circulation or severe heart failure should not wear firm compression without a doctor's advice.
When should I worry about swollen ankles?
Get medical advice the same day if swelling is in one leg only, is severe, painful or sudden, is red or hot, or if you have diabetes. Call 911 if swelling comes with shortness of breath, chest pain or coughing up blood. In pregnancy, call your midwife or doctor immediately if swelling increases suddenly.
Should I wear compression socks to bed for swelling?
Usually not. MedlinePlus advises putting them on in the morning, when legs are least swollen, and they are normally worn during the day. At night, raising your legs on pillows above heart level helps instead. Follow your doctor's advice if it differs.
This article is general information, not medical advice. Talk to your doctor about whether firm compression fits your situation, especially if you have a circulatory condition, diabetes, or are pregnant.
Lorea Lastiri is an SEO consultant who writes the medical-compression guides for Absolute Support, working from published clinical sources and the store's own sizing data. She also helps online stores grow their Shopify sales from the questions their customers search.