Edema
Swelling caused by excess fluid trapped in the body tissues, most often in the feet, ankles, legs, or hands. It can be mild and temporary or a sign of an underlying condition.
⚠ Seek medical attention if:
Sudden or severe swelling; swelling in one leg with pain, warmth, or redness (possible blood clot); swelling with shortness of breath or chest pain; swelling of the face, lips, or throat (allergic reaction); or swelling with a marked drop in urination. Seek urgent medical care for any of these.
Lifestyle factors
Prolonged standing or sitting, long periods of immobility such as long-haul travel, high salt intake, hot weather, pregnancy, tight clothing
Nutritional factors
High sodium intake, low protein intake which can affect fluid balance in the blood, inadequate potassium, and diets high in processed or salty foods
Possible medical causes
Heart, kidney, or liver conditions, venous insufficiency or varicose veins, deep vein thrombosis (blood clot), lymphoedema, thyroid disorders, and medication side effects such as some blood pressure medicines, steroids, or anti-inflammatories
Next steps
See a GP if swelling is persistent, worsening, unexplained, or affects only one limb. Seek urgent care for sudden swelling, swelling with breathlessness or chest pain, or a painful, swollen leg.
Related nutrients (6)
Vitamin C supports the integrity of blood vessel walls, which plays a part in fluid balance
Food sources: Spinach (cooked) (~18 mg vitamin C per cup cooked), Ginkgo nuts (~15 mg per 30g), Chestnuts (~7 mg per 30g (unusually high for a nut)), Avocado (~10 mg per 100g), Onion (~6 mg per 80g (half an onion)), Garlic (~2.5 mg per 9g), Mint leaf (~3 mg per 10g), Thyme leaf (~4 mg per 3g fresh), Basil leaf (~2 mg per 10g), Potatoes (~20 mg per medium potato (with skin)), Sweet potatoes (~22 mg per medium), Corn (~10 mg per cup), Purple sweet potatoes (~20 mg per medium), Kimchi (~10 mg per 50g), Cassava (~20 mg per 100g cooked), Sauerkraut (~7 mg per 50g), Yam (~12 mg per 100g cooked)
Vitamin E may support healthy circulation
Food sources: Pumpkin seeds (~1.6 mg vitamin E per 30g serving), Spinach (cooked) (~3.7 mg vitamin E per cup cooked), Almonds (~7.3 mg vitamin E per 30g (one of the richest sources)), Brazil nuts (~1.6 mg vitamin E per 30g), Pine nuts (~2.7 mg per 30g), Sunflower seeds (~10 mg per 30g (excellent source)), Peanuts (~2.4 mg per 30g), Hazelnuts (~4.5 mg per 30g), Olive oil (~1.9 mg per tbsp), Avocado oil (~2 mg per tbsp), Sesame oil (~1.4 mg per tbsp), Avocado (~2 mg per 100g), Grapeseed oil (~3.9 mg per tbsp (rich source))
Omega-3 fatty acids may support circulation and help with inflammation
Food sources: Salmon (grilled) (~2000 mg omega-3 per 140g fillet), Flax seeds (~6.5 g plant omega-3 (ALA) per 30g (one of the richest sources)), Chia seeds (~5 g plant omega-3 (ALA) per 30g (one of the richest sources)), Walnuts (~2.5 g plant omega-3 (ALA) per 30g (highest of the common nuts))
Potassium helps balance sodium and fluid; adequate intake supports healthy fluid balance
Food sources: Spinach (cooked) (~838 mg potassium per cup cooked), Lentils (cooked) (~731 mg potassium per cup cooked), Pistachios (~290 mg per 30g), Chestnuts (~180 mg per 30g), Lotus seeds (~400 mg per 30g), Ginkgo nuts (~150 mg per 30g), Red beans (adzuki) (~1200 mg per cup cooked), Avocado (~485 mg per 100g (about half an avocado)), Onion (~120 mg per 80g), Kidney beans (~717 mg per cup cooked), Sweet potatoes (~440 mg per medium), Purple sweet potatoes (~450 mg per medium), Potatoes (~610 mg per medium potato), Yam (~670 mg per 100g cooked), Edamame (~675 mg per cup cooked), Cassava (~270 mg per 100g cooked)
Magnesium plays a role in fluid and electrolyte balance
Food sources: Pumpkin seeds (156 mg magnesium per 30g), Brazil nuts (~106 mg magnesium per 30g), Almonds (~76 mg magnesium per 30g), Flax seeds (~120 mg per 30g), Macadamia nuts (~37 mg per 30g), Butternut (~72 mg per 30g), Pecans (~35 mg per 30g), Walnuts (~45 mg per 30g), Pine nuts (~71 mg per 30g), Chia seeds (~95 mg per 30g), Hazelnuts (~46 mg per 30g), Peanuts (~50 mg per 30g), Sunflower seeds (~98 mg per 30g), Sesame seeds (~100 mg per 30g), Lotus seeds (~60 mg per 30g), Red beans (adzuki) (~120 mg per cup cooked), Garbanzo beans (chickpeas) (~78 mg per cup cooked), Kidney beans (~74 mg per cup cooked), Corn (~35 mg per cup), Potatoes (~35 mg per medium potato),
High sodium intake encourages the body to retain fluid, which can worsen swelling
Supplement categories (4)
Supports blood vessel health; food sources are usually enough
Cautions: Caution in people prone to kidney stones due to an oxalate metabolite
May support fluid and electrolyte balance; discuss with a professional first, especially where kidney issues exist
Cautions: Use with caution in kidney disease; check with GP if on medications
May support circulation and help with inflammation-related swelling
Cautions: Caution at doses >3 g EPA+DHA/day if on anticoagulants; stop 2 weeks before surgery
Traditionally used as a mild diuretic, but evidence is limited and it is not for fluid retention with a medical cause
Cautions: Avoid with a known allergy to the ragweed or daisy family; caution with gallbladder or bile duct problems
Related symptoms
Educational information only — not medical advice. This content does not diagnose, treat, or replace consultation with a qualified healthcare professional. Always seek professional medical advice for symptoms, supplement use, or health concerns.