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Start here: a simple guide to swelling and lymph health

New to HealthyLymph? This page walks you through the essentials in order: what your lymphatic system does, how to tell when swelling needs a doctor, and the everyday habits with the best evidence.

By the HealthyLymph Editorial Team · 12 October 2026

1. Check whether you need medical help first

  • Call 999 (or your local emergency number) for swelling with chest pain, breathlessness, coughing up blood or feeling faint.
  • Get an urgent appointment if one leg is swollen without a clear cause, or swelling is sudden, painful, getting worse, red or hot, or you have a high temperature.
  • In pregnancy, call your midwife straight away for sudden swelling of the face, hands or feet, a bad headache or vision problems.

Source: NHS: swollen ankles, feet and legs and NHS: swelling in pregnancy.

2. Understand the basics

Your lymphatic system collects fluid that leaks out of blood vessels and returns it to your blood, filtering it through lymph nodes on the way. It has no pump of its own: your muscles do that job when you move.

How the lymphatic system worksThe parts and what they doLymph and immunityWhy glands swell

3. Work out what kind of swelling it might be

Most swollen ankles come from everyday causes like long periods of sitting, salty food or heat. Lymphoedema is a long-term condition, most often after cancer treatment. Lipoedema is a different condition affecting fat distribution.

Lymphoedema or oedema?How they differSigns worth getting checkedReal lymphatic symptomsWater retentionCommon causesCellulite or lipoedema?What is really going on

4. Build the everyday habits with the best evidence

  1. Move regularly and break up long periods of sitting.
  2. Raise your legs when resting.
  3. Cut salt to 6g a day or less.
  4. Keep to a healthy weight.
  5. Look after your skin to prevent infection.
10-minute routineSimple exercises for heavy legsSalt and swellingCutting salt without noticingMorning habitsFive simple stepsCompressionWhen it helps

5. If you have, or are at risk of, lymphoedema

Ask your GP or cancer team about a specialist lymphoedema service. Treatment combines compression, skin care, exercise and sometimes specialist massage.

Treatment optionsWhat specialists useAfter surgeryEarly signs and risk

6. Be sceptical of quick fixes

Detox kits, cleanses and "lymph drainage" supplements are heavily marketed. We explain what the evidence shows, and compare products honestly if you still want to try one.

Does your lymph need a detox?What detox claims get wrongSupplements comparedIngredients and cautions

General information, not medical advice. Read our editorial standards and medical disclaimer.