Use a soft tape measure at the same fixed points and the same time of day, measure both sides, and write the results down with notes about heat, travel or new medicines. Being overweight raises lymphoedema risk, so tracking weight can help too.[1] Do not wait to collect measurements if swelling is sudden, one-sided or painful.[2]
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What you need
- A soft, flexible tape measure (cm and inches).
- A notebook or notes app.
- Optionally, bathroom scales.
How to measure consistently
- Measure in the morning, before swelling builds.
- Use fixed points, for example 10cm above the ankle bone, and write them down.
- Measure both sides.
- Note heat, travel, long days on your feet or new medicines.
If your lymphoedema team has shown you a method, use theirs.
When to get help
Get medical help first if…
- Call 999 (or your local emergency number) if swelling comes with chest pain or tightness, breathlessness, coughing up blood, or feeling faint. These can be signs of a blood clot in the lungs.[2]
- Get an urgent GP appointment or call 111 if swelling is in one leg only with no clear cause, is sudden, painful or getting worse, the skin is red or hot, or you have a high temperature.[2]
- See a GP if swelling in both legs has not improved after a few days, or you have a heart, kidney or vein condition.[2]
Keep reading
Sources
We checked each source on 12 October 2026. Numbers in the text link to this list.
This guide is general information, not medical advice. It has not been reviewed by a doctor. Read our medical disclaimer.