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

Understanding Foot and Ankle Swelling

Swollen feet and ankles — medically termed peripheral edema — are among the most common complaints that bring patients to podiatrists and general practitioners alike. The swelling may be mild and transient, barely noticeable at the end of a long day, or it may be severe and persistent, making shoes impossible to put on. Some causes of foot swelling are entirely benign; others are signs of serious systemic disease that require prompt medical evaluation and treatment.

At Balance Foot & Ankle in Howell and Bloomfield Township, Michigan, Dr. Tom Biernacki DPM and his team evaluate foot swelling with the goal of identifying the underlying cause — which may be as simple as prolonged sitting or as serious as heart failure or deep vein thrombosis — and directing appropriate treatment.

Common Benign Causes of Foot Swelling

Prolonged standing or sitting causes gravitational dependent edema through venous pooling and reduced lymphatic drainage. During prolonged standing, the calf muscle pump that normally returns venous blood to the heart operates less efficiently. Fluid accumulates in the tissue spaces of the lower legs, feet, and ankles, producing edema that is typically bilateral, improves with elevation, and resolves overnight. This is the most common cause of end-of-day foot swelling in otherwise healthy adults and requires no specific treatment beyond leg elevation and activity variation.

Heat and warm weather cause vasodilation that increases fluid leakage from the small blood vessels into surrounding tissue. Hot weather swelling is typically bilateral, mild, and resolves with cooling and elevation. It is common in summer, particularly in older adults whose venous tone is naturally reduced.

Pregnancy causes physiological lower extremity edema through a combination of increased total blood volume, uterine pressure on the inferior vena cava (impeding venous return from the lower extremities), and hormonal changes including relaxin-mediated ligamentous laxity. Mild bilateral ankle swelling is normal in pregnancy; however, sudden, severe, or one-sided swelling in pregnancy requires urgent evaluation to rule out preeclampsia or DVT.

Ankle sprains and other foot injuries produce local edema at the injury site through the normal inflammatory response. Swelling is usually localized to the injured area and resolves over 1–2 weeks with appropriate RICE management.

Medical Causes Requiring Evaluation

Venous insufficiency from incompetent venous valves allows blood to pool in the lower extremities, producing chronic bilateral swelling that is often worse in the evening and associated with skin changes (brownish discoloration, lipodermatosclerosis — thickened, hardened skin above the ankle). Varicose veins are a visible manifestation of the same venous hypertension. Compression stockings are the cornerstone of management; in advanced cases, venous ablation procedures address the incompetent veins directly.

Lymphedema results from impaired lymphatic drainage — either primary (developmental abnormality of lymphatic vessels) or secondary (damage from cancer treatment, infection, or trauma). Lymphedema typically produces non-pitting edema (swelling that does not leave an indentation when pressed) and can be severe and progressive. Management requires specialized lymphedema therapy including manual lymphatic drainage and compression garments.

Cardiac, renal, or hepatic failure produces bilateral leg and ankle swelling through sodium and water retention, hypoalbuminemia (low blood protein reducing oncotic pressure), and impaired fluid handling. New bilateral leg swelling in an individual without a prior diagnosis of these conditions warrants evaluation for heart failure, kidney disease, or liver disease, including appropriate laboratory and cardiac testing.

Deep vein thrombosis (DVT) produces sudden onset unilateral leg swelling, typically associated with pain, warmth, and erythema of the affected limb. DVT requires urgent medical evaluation and treatment with anticoagulation to prevent pulmonary embolism. Any sudden, unexplained unilateral leg or foot swelling should prompt consideration of DVT and same-day or emergency evaluation.

Red Flag Symptoms That Require Urgent Evaluation

Seek immediate medical evaluation for swelling accompanied by: sudden onset in one leg only; associated shortness of breath or chest pain (suggesting pulmonary embolism); severe pain, redness, or warmth (suggesting DVT or infection); fever (suggesting infectious cause); swelling occurring rapidly during pregnancy; or pitting edema that is new and progressive. These scenarios can involve life-threatening or limb-threatening conditions that require urgent diagnosis and treatment.

General Treatment Principles for Foot Swelling

Treatment depends entirely on the underlying cause. For dependent edema from prolonged standing or sitting, regular leg elevation, calf exercises (ankle pumps, calf raises), and graduated compression stockings are effective. Reducing sodium intake limits fluid retention from dietary sodium loading. For systemic causes, managing the underlying condition (optimizing diuretic therapy for heart failure, renal replacement therapy adjustment, hepatic management) is the priority. For venous insufficiency, compression therapy is the standard of care. Podiatrists manage the foot-specific consequences of chronic edema — skin breakdown, wound formation, nail problems from swollen tissue — and coordinate with primary care or specialists for the systemic management of the underlying cause.

Foot or Ankle Pain? We Can Help.

Balance Foot & Ankle — Howell & Bloomfield Township, MI

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When to See a Podiatrist for Foot Swelling

Foot swelling can indicate conditions ranging from minor sprains to serious circulatory or systemic problems. Persistent or unexplained swelling should always be evaluated by a medical professional. Dr. Tom Biernacki can determine the cause and recommend appropriate treatment at Balance Foot & Ankle.

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Clinical References

1. Ely JW, et al. “Approach to leg edema of unclear etiology.” Journal of the American Board of Family Medicine. 2006;19(2):148-160.
2. Brodovicz KG, et al. “Peripheral arterial disease prevalence and risk factor modification.” Vascular Health and Risk Management. 2012;8:417-424.
3. Trayes KP, et al. “Edema: diagnosis and management.” American Family Physician. 2013;88(2):102-110.

Dr. Tom Biernacki, DPM

Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.