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Chronic Venous Insufficiency

Valves in the leg veins stop closing properly, so blood pools and pressure builds in the skin. It causes aching, swelling, skin damage and ultimately ulcers. Compression is the treatment, and it is the one thing that must never be applied before the arterial circulation has been checked.

Cardiovascular & Metabolic Evidence-Based

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🚨 A calf that becomes swollen, painful, warm and tight over hours or days, especially in one leg, needs assessing the same day for a deep vein thrombosis. That is a different and more urgent problem than chronic venous insufficiency. Never buy and apply compression stockings for a leg that has not been assessed. If the arterial supply to the leg is poor, compression can cause serious damage, which is why an ankle-brachial pressure measurement comes first. A break in the skin that is not healing needs to be seen, not dressed at home indefinitely.
Definition

What Is Chronic Venous Insufficiency?

Leg veins carry blood upward against gravity using one-way valves and the pumping action of the calf muscle. When those valves fail, blood refluxes downward and pressure rises in the small vessels of the skin, particularly around the ankle. That sustained pressure is what causes the swelling, the brown staining, the hardening and eventually the ulceration.

It sits on a spectrum: visible varicose veins at one end, and a venous leg ulcer at the other, with the same underlying mechanism throughout. It is extremely common, it is often dismissed as cosmetic, and the skin changes are the point at which it stops being cosmetic.

The calf muscle is part of the pump. That is why walking helps, why prolonged standing or sitting makes it worse, and why an immobile ankle makes it much worse.

💡 Key Insight: Unusually, an herbal preparation has supporting trial evidence for this condition. A Cochrane review concluded that horse chestnut seed extract is an efficacious and safe short-term treatment for chronic venous insufficiency, while noting several caveats and calling for larger definitive trials1.
Two leg veins, one with a working valve sending blood up and one with a failed valve letting it fall back, beside a lower leg with a swollen ankle and brown staining, and a panel on what to do before compression, starting with having the arteries checked

🧵 Compression is the treatment

It is the foundation of management, and compression also reduces recurrence once an ulcer has healed2. Worn consistently, not occasionally.

⚠️ Arteries checked before compression

Compression on a leg with poor arterial supply can cause serious harm. An ankle-brachial pressure measurement comes first, every time.

🚶 The calf is the pump

Walking and ankle movement drive venous return. Prolonged standing still is worse than walking, and a stiff ankle is worse than both.

By the Numbers

Chronic Venous Insufficiency by the Numbers

15.8%
of adults aged 18 to 79 had chronic venous insufficiency on clinical and ultrasound examination, in a German population study of 3,072 people4
1 in 500
people in the UK are estimated to have a venous leg ulcer, rising to about 1 in 50 over the age of 80 5
6 months
within which most venous leg ulcers close when treated by a healthcare professional trained in compression therapy, though some take longer and a small number do not close5
0.46
the risk ratio for a venous ulcer returning over 6 months with class 3 compression stockings against no compression, in one trial of 153 people, on low-certainty evidence2
1.62ร—
the rate of ulcer closure on high-compression stockings against short stretch bandages at 2 to 4 months, pooled from 4 trials6
1 fl oz
(32 mL) average reduction in leg volume with horse chestnut seed extract against placebo, across six trials in 502 people; an adjunct to compression, not a replacement for it1
Signs & Symptoms

Symptoms of Chronic Venous Insufficiency

Worse as the day goes on, better with the legs up. That pattern is the clue.

SymptomWhat happens
Aching, heaviness, tiredness in the legsWorse by evening, worse after standing, better with the legs raised. Worth knowing: The pattern matters more than the sensation. Arterial pain behaves the opposite way.
Swelling around the ankleSock marks, shoes tighter at night. Worth knowing: Usually settles overnight early on, and stops settling as it progresses.
Varicose veinsVisible, ropy, raised. Worth knowing: Not merely cosmetic when symptoms or skin changes are present.
Brown staining around the ankleDiscoloration that does not fade. Worth knowing: A sign the pressure has been high for a long time. This is when it stops being cosmetic.
Hard, tight, shiny skin at the lower calfThe leg narrowing above the ankle. Worth knowing: Advanced skin change. Report it, and get compression assessed.
Itching and dry, scaly skinOften treated as eczema, but it is a venous problem. Worth knowing: Scratching here breaks skin that heals badly. See eczema for skin care that still applies.
A break in the skin that will not healTypically just above the inner ankle. Worth knowing: A venous leg ulcer. Needs proper assessment, not indefinite home dressing.
Night cramps and restless legsCommon companions. Worth knowing: Mention them to your clinician, though they have other causes too. See iron-deficiency anemia.
⚠️ Learn which way the pain goes. Venous pain is worse standing and better with the legs up. Arterial pain is the reverse: worse with the legs elevated and worse on walking, and it may wake you at night, relieved by hanging the leg out of bed. That distinction is not academic, because compression helps the first and can seriously harm the second. If your leg pain improves when you hang it down, say so before anyone fits a stocking.
Causes

Causes of Chronic Venous Insufficiency

Pressure builds in the leg veins when the one-way valves fail or the calf pump stops working well, and that sustained high pressure is what damages the small vessels in the skin7.

CauseHow It Contributes to Chronic Venous InsufficiencyWhat Helps
Valves that no longer close, and varicose veinsConstant high pressure in the leg veins gradually damages the tiny blood vessels in the skin and makes it fragile, so it breaks easily; varicose veins are swollen, widened veins caused by valves that are not working78Compression fitted after an ankle-brachial pressure measurement, and referral for duplex ultrasound to see which veins are refluxing, both as the assessment and treatment sections set out
A previous deep vein thrombosisA clot in the leg can damage the valves in the veins, which is why a past clot is listed as a risk factor7Compression and the calf-pump measures on this page; a leg that becomes swollen and painful over hours or days needs assessing the same day, as When to Seek Care says
Excess weightBeing overweight or living with obesity increases the pressure in the leg veins7Gradual weight reduction where it applies, which the diet section covers, alongside compression rather than instead of it
Difficulty walking, and a stiff ankleDifficulty walking weakens the calf muscles, which affects the circulation in the leg veins; the calf is the pump that drives blood back up the leg7Walking daily, and ankle circles and flexes through the day if you cannot walk far, as the treatment section describes; symptoms are often worse after standing for a long time and better with the legs raised8
Previous injury or surgery to the legA previous broken bone or a hip or knee replacement is listed as a risk factor, because it may cause a clot or keep you from moving around7Getting moving again as early as your surgical or fracture team allows, and the walking and ankle movement the treatment section describes
Increasing ageRisk rises with age, partly because people find it harder to move around as they get older7; in the German population study, chronic venous insufficiency was found in 15.8% of adults aged 18 to 79 on examination4Age cannot be changed, so the answer is getting the arteries checked, wearing properly fitted compression daily and having any break in the skin looked at early rather than dressed at home
Diagnosis

How Chronic Venous Insufficiency Is Diagnosed

One test comes before treatment, and it is a safety test rather than a diagnostic one.

TestWhat it shows
Ankle-brachial pressure indexWhether compression is safe. This is the test that must come first. Worth knowing: Can read falsely high in diabetes and in stiff arteries, so results are interpreted with the examination. See diabetes.
Duplex ultrasoundShows which veins are refluxing and whether a clot is present. Worth knowing: Availability varies; it guides whether a procedure would help.
Examination of the skinStaining, hardening, healed ulcer scars, active ulceration. Worth knowing: The stage, which drives how urgently to act.
Assessment for deep vein thrombosis if the change was rapidWhether this is an acute clot rather than a chronic problem. Worth knowing: Different urgency entirely. Sudden one-sided swelling is a same-day question.
Ankle movement and mobilityWhether the calf pump is working. Worth knowing: A stiff ankle is a treatable contributor and is almost never assessed.
Weight and waistA major and modifiable contributor to venous pressure. Worth knowing: See obesity.
Blood tests where healing is poorAnemia, diabetes, nutritional deficiency, all of which slow healing. Worth knowing: See iron-deficiency anemia.
Heart, kidney and liver assessment if both legs swellWhether the swelling is venous at all. Worth knowing: Swelling in both legs has other causes; see heart failure and chronic kidney disease.
โš ๏ธ Ask one question before any stocking is fitted: has my ankle-brachial pressure been checked? It is quick, it is the standard of care, and it is the difference between compression being the treatment and compression being a source of harm. Do not buy compression online for an unassessed leg.
Treatment Comparison

Conventional and Holistic Treatment for Chronic Venous Insufficiency

🌿 HOLISTIC
💊 CONVENTIONAL
🌿

Holistic / Functional Approach

Working the calf pump, reducing the load on it and one herbal with real evidence

Best Evidenced Non-Drug Step
Compression, worn consistently, which is also what reduces ulcer recurrence after healing2
Where an Herbal Actually Helps
Horse chestnut seed extract, called an efficacious and safe short-term treatment by a Cochrane review, with caveats1
Timeline
Swelling and aching respond within weeks. Skin staining fades slowly or not at all
Limitation, stated plainly
Nothing here restores a failed valve. This is pressure management, and it works only while it is being done

Full Holistic Approach Includes

  • Compression, correctly fitted, after the arteries are checked, and worn daily rather than on bad days.
  • Walking every day, which drives the calf pump. Standing still for long periods is worse than sitting.
  • Ankle exercises if you cannot walk far: circles and up-and-down flexes, repeatedly, throughout the day.
  • Elevating the legs above hip level for periods during the day, not only at night.
  • Weight reduction where relevant, which lowers the pressure the veins work against. See obesity.
  • Skin care: emollients daily on fragile skin, since a scratch here can become an ulcer.
  • Treating constipation, since straining raises abdominal and therefore venous pressure. This is the same mechanism as hemorrhoids, which commonly coexist.
  • Avoiding long unbroken periods of standing or sitting, and moving the ankles when you cannot avoid them.
🌿 Worth knowing: the honest difficulty with compression is not whether it works. It is that stockings are hard to put on, uncomfortable in heat and easy to abandon. If yours are unwearable, that is a fitting problem with solutions, including different classes, wraps and applicator aids. Ask, rather than quietly stopping.
Supplement Protocol

Evidence-Based Supplements for Chronic Venous Insufficiency

One entry here, horse chestnut seed extract, has Cochrane review support.

🚨 No supplement replaces compression, and none repairs a valve. Never start compression on an unassessed leg, whatever else you are taking. Tell your clinician about everything, because several of the products used for this condition affect bleeding risk and matter if you are on an anticoagulant or facing a procedure. A non-healing wound needs specialist care, not a supplement.
SupplementWhat it is forTypical rangeTimingNotes & cautions
Compression The treatment, listed at the top of this table because it does more than anything below it and is the thing people abandon. Class and fit set after an ankle-brachial pressure measurement Daily, put on before the leg swells in the morning Not a supplement. Also reduces recurrence after an ulcer heals2. If it is unwearable, that is a fitting problem to solve rather than a reason to stop.
Horse chestnut seed extract Reducing leg pain, swelling and itching in chronic venous insufficiency. A Cochrane review called it an efficacious and safe short-term treatment, while noting several caveats and calling for larger definitive trials1. Discuss with your clinician rather than self-selecting a preparation With food Short-term evidence, and an adjunct rather than a replacement for compression. Raw horse chestnut seeds are toxic; only standardized preparations are meant. Caution with anticoagulants and before surgery.
Iron, vitamin C or protein, if deficient Supporting wound healing where a genuine deficiency exists. Set by your clinician on the basis of blood results As advised Test first. Do not supplement iron without a test; excess iron is harmful. See iron-deficiency anemia.
Flavonoid preparations such as diosmin Used in some countries for venous symptoms, with a weaker and less consistent evidence base than compression. Discuss with your clinician With food Not a recommendation, and an adjunct at most. Compression remains the treatment.
🚨 What to avoid, specifically. Compression bought online for a leg nobody has assessed, which can damage a leg with poor circulation. Raw horse chestnut seeds or home preparations, which are toxic; only standardized extracts are meant. Dressing a non-healing ulcer at home for months instead of getting it assessed. Cutting fluid intake to reduce swelling. Products claiming to repair or regenerate valves, which nothing does. And treating symmetrical swelling in both legs as venous without excluding heart, kidney and liver causes.
💡 Where the real leverage is. Getting the arteries checked and the compression properly fitted, wearing it daily rather than on bad days, walking and moving the ankles, losing weight if it applies and getting any non-healing break in the skin seen early. Those five have more evidence behind them than any vein supplement on the market.
What to Expect

What to Expect Over Time

Compression is the treatment, fitted after an ankle-brachial pressure measurement and worn daily rather than on bad days.

Treatment and supportive care, together
First Weeks

Symptoms are usually worse after standing a long time and better with the legs up8. Compression goes on before the leg swells in the morning, and never on a leg nobody has examined: with poor arterial supply it can do serious harm.

Months 1 to 3

Any adjunct sits beside compression, not instead of it. Across six placebo-controlled trials in 502 people, horse chestnut seed extract reduced leg volume by about 1 fl oz (32 mL); the review called it efficacious and safe short term, with caveats and a call for larger trials1.

Months 3 to 12

Most venous leg ulcers close within six months when treated by a professional trained in compression therapy, though some take longer and a few do not close5. Compression raises closure rates compared with none6.

Long Term

Compression continues after an ulcer closes, because that is what prevents the next one: over six months, class 3 stockings gave a reulceration risk ratio of 0.46 against no compression, on low-certainty evidence2.

When to Seek Care

A calf that becomes swollen, painful, warm and tight over hours or days, especially in one leg, needs assessing the same day. Throbbing pain with swelling and red, blue or darkened skin can be a clot in a deep vein: get a same-day appointment, and call 911 or go to the ER if you are also short of breath or have chest pain9. Contact your doctor for any sore that has not closed after two weeks8, and the same day for worsening pain, discharge, spreading redness, smell or fever10.

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Next Steps

Arteries First, Then Compression Daily

Have your arteries checked before any compression is fitted, then wear it daily rather than on bad days. Walk, move your ankles and raise your legs. Diet helps through weight and constipation, alongside compression, never instead of it.

Explore Obesity → Explore Heart Failure →

References & Evidence Notes

Each numbered entry below is either a source you can follow or a note setting out what the evidence does and does not support. Both are numbered together so the markers in the text line up.

Last reviewed October 20, 2026. Supplement entries are cross-checked against the NIH National Center for Complementary and Integrative Health and the Linus Pauling Institute Micronutrient Information Center.3 This page is nutrition education, not medical advice, and it does not replace your doctor. No diet or supplement repairs a failed vein valve, and none replaces compression. Compression must not be applied to a leg whose arterial circulation has not been assessed, because in reduced arterial supply it can cause serious harm. A calf that becomes swollen and painful over hours needs same-day assessment for a clot, and a break in the skin that will not heal needs proper specialist care rather than indefinite home dressing. What nutrition education can do is help you understand the evidence well enough to have a better conversation with the clinician who does treat you.

  1. Pittler MH, Ernst E. Horse chestnut seed extract for chronic venous insufficiency. Cochrane Database Syst Rev. 2012;(11):CD003230. PubMed 23152216. The authors concluded that horse chestnut seed extract is an efficacious and safe short-term treatment for chronic venous insufficiency, while stating that several caveats exist and that larger definitive randomized trials are required to confirm it. The extract is an adjunct to compression, not an alternative to it. ↩ ↩ ↩
  2. Compression for preventing recurrence of venous ulcers. Cochrane Database Syst Rev. 2024. PubMed 38451842. Compression continues to matter after an ulcer has healed, which is where adherence most often lapses and where the next ulcer comes from. ↩ ↩ ↩ ↩
  3. National Center for Complementary and Integrative Health (NIH), nccih.nih.gov, and the Linus Pauling Institute Micronutrient Information Center, lpi.oregonstate.edu/mic. ↩
  4. On how common it is: a German population-based study enrolled 1,350 men and 1,722 women aged 18 to 79 and found, on clinical and duplex ultrasound examination, varicose veins in 22.6% and chronic venous insufficiency in 15.8%, with venous disease significantly associated with itching, heaviness, tightness, swelling and pain after standing or sitting, PubMed 26141786. ↩
  5. On venous leg ulcers: NHS guidance states that a leg ulcer is a sore that takes more than 2 weeks to heal, that venous leg ulcers are estimated to affect around 1 in 500 people in the UK and around 1 in 50 people over 80, that they account for more than 60% of all leg ulcers, and that most heal within 6 months when treated by a healthcare professional trained in compression therapy, while some take longer and a very small number never heal, NHS, venous leg ulcer. ↩
  6. On compression and ulcer healing: a Cochrane review of 48 randomized trials in 4,321 people concluded that compression increases ulcer healing rates compared with no compression, that multi-component systems outperform single-component ones, and that high-compression stockings healed 1.62 times as many ulcers as short stretch bandages at two to four months across four pooled trials, PubMed 23152202. ↩
  7. On what raises the risk: NHS guidance explains that a venous leg ulcer develops when pressure inside the leg veins rises and gradually damages the tiny blood vessels in the skin, and lists obesity or being overweight, difficulty walking, a previous deep vein thrombosis, varicose veins, previous injury or surgery to the leg, and increasing age as risk factors, NHS, venous leg ulcer causes. ↩
  8. On varicose veins and the daily pattern: NHS guidance describes varicose veins as widened veins that look swollen and twisted, lists pain, aching or heaviness, itching, color changes, dry scaly skin and swollen ankles or legs as symptoms, notes that they may be worse after standing for a long time and better with the legs up, and advises seeing a doctor for a sore on the leg that has not healed after 2 weeks, NHS, varicose veins. ↩
  9. On a swollen, painful leg: NHS guidance lists throbbing pain in one leg (usually the calf or thigh), swelling in one leg and red, blue or darkened skin around the painful area as symptoms of a clot in a deep vein, advises an urgent appointment or NHS 111, and advises calling emergency services or going to an emergency department if there is also breathlessness or chest pain, NHS, DVT. ↩
  10. On signs of infection: NHS guidance lists worsening pain, a green or unpleasant discharge, redness and swelling of the skin around the ulcer, a high temperature and an unpleasant smell as symptoms of an infected leg ulcer, and advises contacting a doctor or leg ulcer specialist as soon as possible, NHS, venous leg ulcer symptoms. ↩