Medically reviewed guide · Last updated: 1 September 2026 · Reading time: approx. 10 min

Heavy Legs: Veins, Lymph or Medication?

The most common causes compared

"Heavy legs" describes a feeling, not a diagnosis. Three things above all reveal which cause is behind it: how the symptoms change over the day, where exactly any swelling sits and what makes it better.

The causes in detail

Heavy legs are usually a congestion problem: blood or tissue fluid is not flowing back to the heart quickly enough. If marked swelling is the main issue, you will find the detailed explanation under water retention; for cramping or stabbing pain, under calf pain. This article is about the dull feeling of heaviness and its causes.

Weak veins and varicose veins: the classic

Blood from the legs has to travel back to the heart against gravity. Helping it along are the venous valves, which work like non-return valves, and the calf muscles, which squeeze the veins with every step. If the valves no longer close properly, blood pools in the lower legs — chronic venous weakness (chronic venous insufficiency). Typical signs are heaviness, tightness, itching, calf cramps at night and slightly swollen ankles in the evening, made worse by long periods of standing or sitting and by heat. Walking and putting your legs up help.

Risk factors are a family tendency, pregnancies, older age, being overweight and jobs that involve a lot of standing. Varicose veins are often visible, but not always. Over the years, brownish discolouration, rust-coloured petechiae, eczema, hardened skin and eventually poorly healing wounds on the inner ankle can develop. First step: exercise and compression; with marked symptoms, an ultrasound scan of the veins (duplex ultrasound).

Hormones: cycle, pregnancy, the pill

Oestrogens and progestogens make the vein walls more pliable and encourage fluid retention. Many women know the feeling of heavy legs in the days before their period. In pregnancy, the pressure of the womb on the pelvic veins adds to this. The contraceptive pill and hormone replacement therapy can also encourage heaviness and swelling — and at the same time increase the risk of thrombosis. That is why one rule applies particularly here: a leg that suddenly swells on one side is not a hormone effect until proven otherwise.

Lymphoedema: when drainage fails

The lymphatic system carries away protein-rich tissue fluid. If it has been underdeveloped from birth, or damaged by cancer surgery with removal of lymph nodes, by radiotherapy or by repeated erysipelas (a bacterial skin infection), fluid stays in the tissue. The swelling typically reaches the top of the foot and the toes, which can look box-shaped. At first it is soft and goes down overnight; if left untreated, the tissue becomes firmer over time. One-sided lymphoedema after cancer treatment should always be assessed by a doctor. The treatment of choice is complex decongestive therapy, made up of manual lymphatic drainage, compression, exercise and skin care. Water tablets do not help with lymphoedema.

Lipoedema: painful, symmetrical, mostly women

In lipoedema, the fat under the skin on the legs, and sometimes on the arms, increases abnormally and symmetrically, while the feet and hands stay slim. Characteristic features are pain on pressure and touch, bruises that appear quickly and a feeling of heaviness. It often begins in phases of hormonal change such as puberty, pregnancy or the menopause. Lipoedema is not the result of eating too much; additional excess weight can, however, make the symptoms considerably worse, while losing weight changes the lipoedema fat itself only a little. Treatment consists of compression, exercise, weight management if you are overweight and, in selected cases, liposuction.

Heart, kidneys, liver and thyroid

If both legs swell evenly and a dent remains after pressing with a finger, an internal cause may be behind it. With heart failure, shortness of breath on exertion or when lying down, passing urine at night and rapid weight gain typically come along with it. Chronic kidney disease can show itself through very frothy urine and swelling in the face as well, and cirrhosis of the liver through an increasing waist size. With an underactive thyroid, the swelling tends to feel doughy, accompanied by tiredness and sensitivity to cold.

Thrombosis and circulatory disorders: acute emergency or chronic cause

A deep vein thrombosis usually makes itself felt on one side: the leg swells within hours to days, the calf feels tight and painful, and the skin is warm and reddish or bluish. Risk factors are operations, bed rest, long journeys, cancer, pregnancy and hormone preparations. More on this under thrombosis and pulmonary embolism. Peripheral arterial disease is quite different: here it is not the outflow that is lacking, but the inflow. It usually develops over years and shows up as calf pain when walking that forces you to stop after a certain distance and passes quickly at rest, often with cool, pale feet. A sudden blockage of a leg artery, on the other hand, is an emergency: the leg abruptly becomes cold, pale and very painful. Important: with advanced circulatory disorders, compression stockings can do harm — which is why the pulses in the feet are checked before they are prescribed.

Lack of exercise, heat and other triggers

Sitting for long periods in the office or when travelling, summer heat, being overweight and tight clothing make even healthy legs feel heavy. An urge to move your legs in the evening at rest that eases when you walk about fits restless legs syndrome better than weak veins.

Self-tests: first clues at home

These tests do not replace a diagnosis — the ultrasound scan is what decides. But they help you describe the pattern, and that saves time at the practice.

• The dent test: press your thumb firmly on the front of your shin or behind the ankle for about ten seconds. If a dent remains, there is fluid in the tissue. With lipoedema, typically no dent remains.
• The toe sign (Stemmer's sign): try to lift a fold of skin on the top of the second toe, at its base. If that does not work, or the fold is noticeably thickened, that is a clue to lymphoedema.
• The tape measure comparison: measure the circumference of both calves at the thickest point and above the ankles, morning and evening. A new difference of more than about three centimetres between the two sides should be checked promptly.
• The daily pattern: slim in the morning, sock marks in the evening — typical of veins and gravity. Just as thick in the morning — more likely lymph, lipoedema or an internal cause.
• The legs-up and walking test: if things feel lighter after 20 to 30 minutes with your legs up or after a brisk walk, that points to the veins. If calf pain forces you to stop when walking, it points more towards a circulatory disorder.
• The scales check: if both legs are swollen, weigh yourself every morning for a week. A rapid gain of more than about two kilos in three days is a clue to fluid retention caused by the heart or kidneys.

Warning signs: when not to wait

• A leg that is suddenly swollen on one side, painful, warm or bluish in colour
• Together with shortness of breath, chest pain, a racing heart or coughing up blood
• A cold, pale, numb or very painful leg
• Red, hot, painful skin with a fever or chills (a possible sign of erysipelas)
• Swelling in both legs with shortness of breath when lying down, a cough at night or rapid weight gain
• Open sores on the lower leg that do not heal

The treatment pathway: step by step

1. Adjust your everyday routine. The calf muscle pump is the most effective help for your veins: walking, climbing stairs, rocking your feet up and down while sitting. Add to that putting your legs up, cool showers and avoiding heat.
2. Examination at the GP practice. A look at the skin and veins, the dent test, the foot pulses and, depending on the findings, blood tests (kidneys, liver, protein, thyroid, heart markers) and a urine test — plus a look at your medication plan.
3. Compression stockings. They have been shown to relieve venous symptoms and swelling. They are prescribed, measured in the morning when the leg is not swollen, and put on before you get up. An advanced circulatory disorder is ruled out beforehand.
4. Specialist assessment. In phlebology or angiology, ultrasound clarifies whether veins are affected and which ones; varicose veins can be sealed, injected (sclerotherapy) or removed. For lymphoedema and lipoedema, a lymphology practice takes over the decongestive therapy.
5. Take a realistic view of vein remedies. Horse chestnut seed or red vine leaf extract can slightly improve the feeling of tightness and swelling in studies; the evidence is limited, and they do not replace compression.
6. Water tablets only with good reason. With a heart or kidney cause they are often necessary; with weak veins, lymphoedema and lipoedema they generally make no sense. This decision is always made by the practice treating you.

The medication angle: when the tablet goes to your legs

New heavy, swollen legs in the weeks after a new prescription are a pattern worth checking. Some active substances are well known for it.

Calcium channel blockers: the most common suspect

Blood pressure medicines from the dihydropyridine group of calcium channel blockers — above all amlodipine, but also nifedipine, felodipine or lercanidipine — cause ankle oedema depending on the dose; according to the summary of product characteristics, oedema is one of the very common side effects of amlodipine. The reason: these active substances widen the small arteries more than the veins, so more fluid passes into the tissue in the capillary bed. Because there is no excess fluid in the body, water tablets hardly help here. Tried and tested approaches are a lower dose, combining it with an ACE inhibitor or sartan, which can ease the oedema, or switching to another active substance.

Pregabalin, glitazones, dopamine agonists

Pregabalin and gabapentin, used for nerve pain and, in the case of pregabalin, also for anxiety disorders, frequently cause fluid retention in the legs, often together with weight gain. The diabetes medicine pioglitazone holds fluid in the body and must not be used in heart failure. Dopamine agonists such as pramipexole, which are prescribed for Parkinson's disease and restless legs, can also trigger swelling of the legs.

Cortisone, hormones and painkillers

Cortisone at higher doses and over longer periods encourages the body to retain salt and water. Oestrogens from the pill or hormone replacement therapy can increase swelling and the feeling of heaviness. Classic painkillers such as ibuprofen, diclofenac or naproxen hold back sodium and water and can make oedema considerably worse in heart or kidney failure. If you take them for aching legs, you should only do so briefly without medical advice — according to the package leaflet usually no longer than three to four days in a row — and check with your doctor beforehand if you have heart or kidney disease.

Stopping can trigger it too

If you have been taking water tablets for a long time and stop them abruptly, you may temporarily retain more fluid. This also applies to non-prescribed use for weight loss, which can set off a cycle of swelling and taking the tablets again.

How to prevent heavy legs

• Keep the calf pump busy — walking, cycling, swimming and climbing stairs are training for your veins. At the office, rocking your feet up and down, rising onto your tiptoes and short walking breaks help.
• Avoid heat, make use of cold — hot baths, saunas and long sunbathing widen the veins; a cold shower from the feet upwards does you good. Some medicines make you more sensitive to heat; more in the guide Medications and heat.
• Prepare for long journeys — get up regularly, drink enough, and wear compression stockings if you have weak veins. If your risk of thrombosis is increased, discuss prevention with your doctor beforehand.
• Weight and clothing — every kilo less takes strain off your veins; flat shoes support the calf pump, and tight clothing obstructs the return flow.
• Note down prescription changes — if you record new symptoms with the date, you will often spot a medication effect after just a few weeks.

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