Oedema describes the abnormal accumulation of interstitial fluid in body tissues — producing swelling that may be localised (a sprained ankle, a bee sting, cellulitis, lymphoedema) or generalised (from systemic causes affecting fluid regulation). The pathophysiological mechanisms include increased capillary hydrostatic pressure (heart failure, venous insufficiency), decreased oncotic pressure (hypoalbuminaemia from liver disease, nephrotic syndrome, malnutrition), increased capillary permeability (inflammation, allergy, sepsis), and impaired lymphatic drainage (lymphoedema following surgery, radiation, or infection). Pitting oedema (leaves an indentation when pressed) is characteristic of cardiac, renal, and hepatic causes; non-pitting oedema suggests hypothyroid or lymphatic origin.

What lifestyle changes can help with swelling?

Elevating affected limbs above heart level reduces gravitational oedema. Compression garments are important for chronic venous insufficiency and lymphoedema. Sodium restriction (below 2 g/day) reduces fluid retention in cardiac and renal oedema. Regular walking and leg movement improve venous return. Avoiding prolonged sitting or standing reduces postural oedema.

What integrative approaches support swelling?

Management is aetiology-directed. Heart failure: diuretics (furosemide), ACE inhibitors, beta-blockers, and sodium restriction. Nephrotic syndrome: treat underlying cause, diuretics, ACE inhibitors. Venous insufficiency: compression hosiery, leg elevation, exercise. Lymphoedema: decongestive lymphatic therapy (CDT) — manual lymphatic drainage and compression. Acute allergic oedema (angioedema): adrenaline if severe, antihistamines, corticosteroids. DVT: anticoagulation.

When should I seek professional support for swelling?

Seek urgent medical assessment for sudden onset unilateral leg swelling (possible DVT), generalised rapid-onset swelling (possible anaphylaxis or acute heart failure), facial swelling with breathing difficulty (possible angioedema — emergency), or swelling with breathlessness and orthopnoea (possible acute pulmonary oedema — emergency). Seek routine assessment for persistent bilateral lower limb swelling.

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Swelling

Abnormal fluid accumulation in body tissues causing visible or palpable enlargement — from localised inflammation to systemic oedema from cardiac, renal, or hepatic causes.

Understand what may be causing this

Reviewed by Internal Medical Editorial Team · Integrative Health Content Review26 March 2026High Evidence

Quick answer

Swelling (oedema) describes an abnormal accumulation of fluid in body tissues producing visible enlargement. ICD-10: R60 (oedema, not elsewhere classified); ICD-11: MG25. A non-specific sign with causes ranging from localised inflammation to systemic conditions affecting the heart, kidneys, or liver.

Recognition

Do any of these feel familiar?

People describe swelling as a visible or palpable increase in the size of an area — a joint that appears larger than it should, ankles that are tight in shoes by the afternoon, a face that looks puffy on waking, or an area of skin that feels taut and full. Accompanying sensations include heaviness (the swollen area feeling heavier than normal), tightness (the skin stretched over accumulated fluid feeling tense), and sometimes warmth and redness when inflammation is the driver. Acute traumatic swelling arrives immediately and dramatically. Gradual oedema from systemic causes often goes unnoticed until clothing or footwear fits differently, or another person comments on the change.

What is Swelling?

Abnormal fluid accumulation in body tissues causing visible or palpable enlargement — from localised inflammation to systemic oedema from cardiac, renal, or hepatic causes.