Short answer: long periods sitting or standing, salty food, travel, pregnancy and some medicines can all influence swelling in the ankles, feet or legs. Gentle movement, raising the legs and avoiding tight clothing may help mild temporary swelling, but new, one-sided, severe or sudden swelling needs medical advice.
1. Sitting or standing still
Fluid can pool in the lower legs when you remain in one position for a long time. This is common during desk days, long drives and flights.
Try: regular walking breaks, gentle ankle and calf movement, and raising your legs when you can. Avoid sitting or standing still for long periods.
2. Salty food
Eating too much salty food is one of the common causes of oedema listed by the NHS. Much of the salt in the UK diet comes from packaged and prepared food, so comparing labels can be more useful than focusing only on the salt shaker.
Try: check the “salt” figure on nutrition labels, compare similar products, and choose lower-salt versions more often. Do not make major dietary changes if a clinician has given you specific instructions for a kidney, heart or other condition.
3. Travel and heat
Long journeys combine immobility with changes in routine. The practical measures are simple: move regularly where it is safe, avoid very tight clothes or footwear, and raise the legs after the journey if they feel puffy.
Unexplained swelling in only one leg—especially if sudden, painful, red or hot—needs urgent assessment and should not be dismissed as ordinary travel swelling.
4. Pregnancy and the menstrual cycle
Gradual swelling of the legs, ankles, feet and fingers can be common in pregnancy and is often worse later in the day. Regular walks, foot exercises, comfortable shoes and resting with the feet up may help.
A sudden increase in swelling during pregnancy, especially with a severe headache, visual symptoms, pain below the ribs or feeling very unwell, requires immediate contact with a midwife, GP or labour ward.
Some people also notice temporary puffiness around menstruation. Record the timing and discuss symptoms with a pharmacist or GP if they are severe, new or disruptive rather than assuming they are “just hormonal”.
5. Medicines and health conditions
Some blood-pressure medicines, contraceptive pills, hormone therapy, antidepressants and steroids can contribute to swelling. Varicose veins, thyroid problems and conditions affecting the heart, kidneys or liver are also possible causes.
Do not stop prescribed medicine on your own. Ask the prescriber or a pharmacist to review the timing, dose and other possible causes.
6. Hydration
There is no single fluid target that is right for everyone. Drink normally unless a healthcare professional has advised a restriction or a specific intake. Avoid trying to “dry yourself out” for a lower scale weight, and avoid forcing excessive fluid. People with heart or kidney conditions may need individual advice.
A simple tracking checklist
If the swelling is mild and has no warning signs, note:
- whether it affects one side or both;
- when it starts and whether it improves overnight;
- recent long journeys or long periods sitting or standing;
- unusually salty meals;
- menstrual timing or pregnancy;
- new medicines or dose changes; and
- pain, redness, heat, breathlessness or other symptoms.
This record can make a conversation with a pharmacist or GP more useful.
Where do supplements fit?
Food supplements are not treatments for oedema. When a product supplies qualifying amounts, magnesium may claim that it contributes to normal electrolyte balance and vitamin B6 may claim that it contributes to the regulation of hormonal activity. These are general nutrient functions, not promises to reduce ankle swelling, water weight or bloating.
Our ingredient guide explains the label, and our UK product comparison separates registered medicines from ordinary food supplements.
When not to wait
Use NHS 111 or urgent GP help for unexplained one-sided swelling, severe or sudden swelling, redness or heat, or swelling with fever. Call 999 for swelling with breathing difficulty, chest pain or tightness, coughing up blood, faintness or confusion.
Sources
- NHS: swollen ankles, feet and legs (oedema)
- NHS: swollen ankles, feet and fingers in pregnancy
- Great Britain Nutrition and Health Claims Register
Written by: Barry Lees, founder of The Health Improvers
Last reviewed: 2 August 2026
This guide is general information, not diagnosis or medical advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle.
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