Swollen Feet and Ankles: 10 Causes and When to Worry

Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

Why Are My Feet and Ankles Swollen?

Peripheral edema — fluid accumulation causing swelling in the feet and ankles — is one of the most common complaints in medicine. It affects millions of people and ranges from entirely benign (sitting too long on a flight) to life-threatening (heart failure, deep vein thrombosis).

At Balance Foot & Ankle in Howell and Bloomfield Township, MI, we evaluate foot and ankle swelling as part of comprehensive podiatric care, and refer to appropriate specialists when systemic causes are suspected.

How Edema Forms

Normal fluid exchange occurs at the capillary level — plasma leaks into tissues and is returned via the lymphatic system and venous return. Edema develops when this balance breaks down:

• Increased capillary pressure (venous insufficiency, heart failure)
• Decreased oncotic pressure (low albumin from liver/kidney disease)
• Increased capillary permeability (inflammation, infection)
• Lymphatic obstruction
• Sodium and water retention (kidney disease, medications)

10 Common Causes of Foot and Ankle Swelling

1. Prolonged Standing or Sitting

Gravity-dependent edema from inactivity is the most common benign cause. Long flights, desk jobs, and standing professions all cause end-of-day ankle swelling. Resolves with elevation and movement.

2. Venous Insufficiency

Damaged or incompetent leg vein valves allow blood to pool in the lower extremities. Chronic venous insufficiency causes progressive leg swelling, discoloration (hemosiderin staining), and eventually skin ulceration. Compression therapy (20–30 mmHg graduated stockings) is the cornerstone treatment.

3. Heart Failure

When the heart can’t pump effectively, fluid backs up into the venous system and tissues. Bilateral leg swelling that worsens throughout the day and improves with overnight rest is a classic heart failure pattern. Other signs: shortness of breath, especially lying down; fatigue; weight gain.

⚠️ Seek medical evaluation promptly if these symptoms are present.

4. Kidney Disease

The kidneys regulate fluid and sodium balance. Kidney dysfunction causes fluid retention and reduced albumin production, both contributing to edema. Puffiness around the eyes in the morning is another clue.

5. Liver Disease

Liver cirrhosis reduces albumin production and causes portal hypertension. Low albumin reduces oncotic pressure, allowing fluid to leak from vessels. Abdominal swelling (ascites) often accompanies leg edema in liver disease.

6. Medications

Many commonly prescribed medications cause fluid retention:

• Calcium channel blockers (amlodipine, nifedipine) — extremely common cause
• NSAIDs (ibuprofen, naproxen)
• Corticosteroids
• Hormones (estrogen, testosterone)
• Gabapentin/pregabalin
• Thiazolidinediones (pioglitazone)

7. Deep Vein Thrombosis (DVT)

A blood clot in the deep veins of the leg causes acute, often unilateral swelling with calf tenderness and warmth. DVT requires urgent evaluation — clots can break loose and cause pulmonary embolism (life-threatening).

⚠️ Sudden one-sided swelling with calf pain = emergency room visit.

8. Injury or Infection

Ankle sprains, fractures, and infections (cellulitis) cause localized inflammatory edema. The swelling is typically unilateral and associated with pain, warmth, and (for infections) redness.

9. Lymphedema

Damage to lymphatic vessels (from cancer treatment, infection, or congenital abnormality) causes protein-rich fluid accumulation. Lymphedema is progressive without treatment and causes characteristic “pitting” that becomes non-pitting over time as the tissue fibroses. Treatment: specialized lymphatic massage and compression garments.

10. Hypothyroidism

Low thyroid function causes myxedema — a non-pitting generalized swelling due to glycosaminoglycan accumulation in tissues. Associated with fatigue, cold intolerance, weight gain, and dry skin.

Pitting vs. Non-Pitting Edema

Press your thumb firmly into the swollen area for 5 seconds and release:

• Pitting edema: An indentation remains — suggests cardiac, renal, hepatic, or venous causes
• Non-pitting edema: No indentation — suggests lymphedema or myxedema (hypothyroidism)

When to Seek Medical Evaluation Immediately

• Sudden swelling in one leg with calf pain or warmth (DVT)
• Swelling with shortness of breath, chest pain, or palpitations (heart failure, PE)
• Swelling with fever, redness, and increased warmth (cellulitis)
• Swelling in a diabetic patient with any wound or skin breakdown
• Rapidly progressive bilateral swelling

Home Management for Benign Swelling

• Elevation: Legs above heart level for 30 minutes, 3× daily
• Compression socks: 15–20 mmHg (over-the-counter) or 20–30 mmHg (prescription) graduated compression
• Movement: Calf muscle pumping exercises stimulate venous return
• Sodium restriction: Less than 2,000 mg daily
• Hydration: Adequate water intake (counterintuitively helps reduce retention)

If swelling persists more than 2 weeks without clear cause, or is associated with other symptoms, a comprehensive evaluation is warranted.

Ready to Get Relief? Book an Appointment Today.

Board-certified podiatrists Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin see patients daily at our Howell and Bloomfield Township, MI offices.

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📞 (810) 206-1402

When to See a Podiatrist for Swollen Feet and Ankles

If your feet or ankles are persistently swollen, a podiatrist can evaluate whether the cause is musculoskeletal, vascular, or systemic and coordinate appropriate care. At Balance Foot & Ankle, we assess lower extremity edema and provide targeted treatment at our Howell and Bloomfield Hills offices.

Learn About Our Evaluation Options | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Ely JW, et al. Approach to leg edema of unclear etiology. J Am Board Fam Med. 2006;19(2):148-160.
2. Trayes KP, et al. Edema: diagnosis and management. Am Fam Physician. 2013;88(2):102-110.
3. Cho S, Atwood JE. Peripheral edema. Am J Med. 2002;113(7):580-586.