Swollen Feet and Ankles: Causes, When It’s Serious, and What to Do

Quick answer: Treatment for swollen feet ankles causes treatment follows a stepwise approach: 1) conservative care first (rest, ice, supportive footwear, OTC anti-inflammatories), 2) physical therapy and targeted exercises, 3) in-office treatments (injections, custom orthotics) if conservative fails at 4-6 weeks, 4) surgery for refractory cases. Most patients resolve at step 1 or 2. Call (810) 206-1402.

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

Swollen feet and ankles (edema) is one of the most common complaints in podiatric practice — and also one of the most diagnostically varied. Foot swelling can result from something as benign as sitting on an airplane or something as serious as congestive heart failure. Here’s how to tell the difference and what to do.

Common Causes of Swollen Feet and Ankles

1. Prolonged Sitting or Standing (Gravity-Dependent Edema)

The most common cause of mild, bilateral (both feet) foot swelling. When the legs are dependent for extended periods, fluid gradually accumulates in the lower extremity tissues. This is especially common on long flights, during pregnancy, or in jobs requiring prolonged standing. The swelling is symmetric, painless, and resolves with elevation.

2. Venous Insufficiency

Chronic venous insufficiency (CVI) occurs when the one-way valves in the leg veins fail, allowing blood to pool. The resulting swelling is typically worse in the evening, improves overnight, and may be accompanied by varicose veins, skin darkening, and aching or heaviness in the calves. This is very common and can cause significant long-term complications if untreated.

3. Lymphedema

Lymphedema is swelling caused by impaired lymphatic drainage. Unlike venous edema, lymphedema is firm and pitting does not persist well. It typically starts in one extremity, does not resolve with elevation alone, and worsens over time without treatment. Common causes include lymph node removal (cancer surgery), radiation therapy, or primary lymphatic valve malfunction.

4. Congestive Heart Failure (CHF)

CHF causes bilateral, pitting edema that is worst in the ankles and lower legs. It may be accompanied by shortness of breath, fatigue, and weight gain from fluid retention. This is a serious medical condition requiring urgent evaluation.

5. Kidney Disease

The kidneys regulate fluid balance. When kidney function is impaired, fluid accumulates throughout the body, including the feet. Periorbital edema (puffy eyes in the morning) alongside foot swelling is a classic sign of nephrotic syndrome.

6. Ankle Injury or Arthritis

Acute trauma (sprain, fracture), gout flare, or inflammatory arthritis (rheumatoid, psoriatic) cause unilateral swelling, typically localized to the injured or inflamed joint. Gout classically presents with sudden, severe swelling and redness of the big toe joint.

7. Medication Side Effects

Many common medications cause peripheral edema as a side effect, including: calcium channel blockers (amlodipine), corticosteroids, NSAIDs, gabapentin/pregabalin, and certain diabetes medications (thiazolidinediones). Review medications with your physician if swelling began after starting a new drug.

Warning Signs That Require Urgent Evaluation

Seek immediate medical care if foot/ankle swelling is accompanied by:

• Chest pain or shortness of breath (possible heart or pulmonary issue)
• Pain in only one calf with warmth and redness (possible deep vein thrombosis — DVT)
• Sudden severe swelling in one leg without obvious injury
• Swelling with fever (possible infection)
• Swelling during pregnancy with headache, vision changes, or upper abdominal pain (possible preeclampsia)

Treatment and Self-Care

For simple gravity-dependent swelling: compression stockings (15–20 mmHg), elevation above the level of the heart, regular walking, and reduction of sodium intake are highly effective. Dr. Biernacki can evaluate foot and ankle swelling, perform ankle-brachial index testing to assess vascular function, and coordinate referral to cardiology or vascular surgery when indicated.

In-Office Treatment at Balance Foot & Ankle

If home treatment isn’t providing relief for your foot and ankle injuries, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.