Improve poor circulation in legs

First things first: “poor circulation” is too broad a term

Many people are quick to label heavy, tense, or swollen legs as “poor circulation.” But medically speaking, these are different things. The distinction determines whether compression is useful or not.

Roughly, there are three directions. With venous complaints, blood does not flow efficiently enough from your legs back to your heart. With arterial complaints, too little blood enters your leg due to narrowed arteries. And there are other causes, such as lymphedema, thrombosis, or heart failure.

This distinction is important, as compression mainly works for venous complaints and swelling. In severe arterial problems, strong compression can even be dangerous. Do you want to know what compression does at all? Read what do compression socks do exactly?

What you usually see in athletes

Justin, physiotherapist and co-founder of KINEX, explains: “For athletes, there is often no direct evidence of a true circulatory disorder. Usually, it concerns legs that feel heavy, tense, or somewhat swollen after a workout, a long day at work, or prolonged sitting.”

The key lies in your calf muscles. They act as a pump that helps blood flow from your legs back up. As Justin explains: “If you sit for a long time, move little, or are very fatigued, that pump works less actively. A combination of intense training, insufficient recovery, and then prolonged sitting can also cause that full feeling in the legs.”

Drawing from his background in physiotherapy, Justin always looks at the complete picture: how much someone trains, how much they sit or stand, what their recovery looks like, and whether there are other complaints.

What compression does physiologically

Graduated compression applies the most pressure around the ankle and decreases towards the calf. This has several plausible effects on the venous system. It limits the dilation of veins, reducing the amount of blood that pools in your lower leg. It supports the function of the calf muscle pump. And it limits the leakage of fluid from capillaries into the tissue.

The reduction of swelling is one of the best-demonstrated effects of compression. In a study where young adults sat still for three hours, blood pooling in the calf increased by 10.5 percent without compression and by only 4.3 percent with compression (Horiuchi and Stoner, 2021). Important detail: the same compression did not restore arterial vascular function. So it works on drainage, not on supply.

This also explains why compression works better in combination with movement than during complete stillness. You can read how the pressure gradient works exactly in graduated compression explained.

When compression helps

Justin: “Compression mainly helps people who suffer from heavy or slightly swollen legs. For example, after a long endurance training, during a long journey, or when someone stands all day or sits behind a desk.”

Maarten, co-founder of KINEX, recognizes this from his own experience: “Especially after long runs, I notice it. Without compression, my lower legs can feel quite heavy and somewhat swollen later in the day. With compression socks, it feels much calmer.”

He wears them specifically: “I often wear them for a few hours after training. Especially if I'm then in the car, at work, or can't move much.” However, Justin adds a fair caveat: “Compression is not a miracle cure. You still need to keep moving, recover well, and regularly change position. See it as additional support for the basics, not as a replacement for it.”

When you should not use compression

This is the most important part of this article. Compression is not advisable for every cause of circulatory complaints.

Justin is clear about it: "With arterial problems, firm compression can be unsuitable. If you suddenly get a thick, red, warm, or painful leg, or if your toes turn blue, pale, cold, or numb, you shouldn't just put on a tighter sock. You need to find out what's going on first."

This also applies to open wounds, severe skin problems, or certain vascular, heart, and diabetes conditions. In medical literature, severely reduced arterial blood flow, severe heart failure, and severe diabetic nerve damage, among others, are situations where compression should only be used under the guidance of a doctor.

Red flags you need to know

Some signs are not indicative of ordinary tired legs. Seek immediate medical attention if you experience sudden, severe pain in a leg or foot combined with paleness, a cold foot, tingling, numbness, or loss of strength. This could indicate an acute arterial occlusion.

Have it assessed the same day: a new swelling in one leg, especially with pain, warmth, or redness. This can be consistent with thrombosis, especially after surgery, a long journey, or a period of little movement. Do not put on a tight sock yourself, but first rule out what is happening.

Call the emergency number immediately for sudden shortness of breath, chest pain, or coughing up blood in combination with leg complaints. This could indicate a pulmonary embolism.

Not acute, but worth investigating: recurrent calf pain during walking, slow-healing wounds, a persistent difference in color or temperature between your legs, or new complaints if you have diabetes or a known cardiovascular disease.

What else helps

Compression is no substitute for movement. Walking, regularly stretching and bending your ankles, and activating your calf muscles support your venous drainage. Interrupt long periods of sitting or standing with a few minutes of walking. Elevating your legs can temporarily reduce a heavy feeling.

One misconception: drinking extra water does not treat circulation problems. Staying normally hydrated is sensible, but there is no strong evidence that drinking a lot changes anything in this regard.

What compression can and cannot do

Well-substantiated: graduated compression supports venous return, helps limit blood pooling and temporary swelling, and can relieve heavy, tired legs during long periods of sitting, standing, or traveling.

Not proven: that compression improves arterial circulation, that more mmHg automatically yields more effect, or that a sock prevents varicose veins or thrombosis.

The fairest formulation is therefore that compression supports drainage, not that it “improves circulation.” An important distinction.

Conclusion

Compression can alleviate heavy and swollen legs when the cause is venous, especially around long training sessions, travel, and days full of sitting or standing. It is targeted support, not a miracle cure, and for red flags or possible arterial complaints, a doctor should first examine the situation. If you are unsure which sock fits, read tired, heavy legs: causes and what helps.

Perseverance pays off. Keep moving, and give your legs the right support.

Medical disclaimer

This article provides general information and is not personal medical advice. In cases of red flags, a possible arterial condition, sudden swelling in one leg, or suspected thrombosis, a medical evaluation should first take place.

Sources

ESVS Clinical Practice Guidelines on Chronic Venous Disease (2022) · 2024 ACC/AHA Guideline for Lower Extremity Peripheral Artery Disease · Horiuchi & Stoner (2021), Vascular Medicine · Kakkos et al. (2018), EJVES · Stücker et al. (2024/2025), Vasa · Mosti & Partsch (2014), EJVES · Silva et al. (2021), systematic review · Rabe et al. (2020), Phlebology · Wang et al. (2025), Journal of Sport and Health Science