What Is Edema?

Edema is swelling caused by fluid buildup in the body’s tissues. It may affect one leg, both legs, the ankles, feet, or other areas of the body.

The swelling may be mild and temporary or persistent enough to make shoes feel tight, leave sock marks, or cause the skin to appear stretched.

What Causes Swollen Legs?

Common causes include:

• Prolonged sitting or standing
• High salt intake
• Certain medications
• Varicose veins
• Chronic venous insufficiency
• Heart failure
• Kidney disease
• Liver disease
• Thyroid disorders
• Lymphatic problems
• Blood clots
• Pregnancy

Because leg swelling has many possible causes, a medical evaluation may be needed when it persists, worsens, or occurs with other symptoms.

When Can Leg Swelling Be Heart-Related?

The heart helps circulate blood throughout the body. When the heart cannot pump effectively, pressure may build in the veins and cause fluid to collect in the legs.

Heart-related edema may occur with:

• Shortness of breath
• Difficulty breathing while lying down
• Waking at night feeling breathless
• Rapid weight gain
• Unusual fatigue
• Reduced exercise tolerance
• Heart palpitations
• Swelling in both legs
• Abdominal swelling

These symptoms may require cardiovascular testing.

One Swollen Leg vs. Both Legs

Swelling in both legs is more commonly associated with systemic conditions such as heart, kidney, liver, medication, or circulation problems.

Sudden swelling in only one leg may be associated with:

• Deep vein thrombosis
• Infection
• Injury
• Vein obstruction
• Lymphatic blockage

One-sided swelling accompanied by pain, redness, or warmth requires prompt medical attention.

What Is Pitting Edema?

Pitting edema leaves a temporary indentation when pressure is applied to the swollen skin.

It may occur with heart failure, venous insufficiency, kidney conditions, or other causes of fluid retention. The presence of pitting alone does not identify the cause, so further assessment may be necessary.

When Should You See a Cardiologist?

Consider a cardiovascular evaluation when swelling:

• Persists or repeatedly returns
• Affects both ankles or legs
• Becomes worse in the evening
• Occurs with shortness of breath
• Is accompanied by chest discomfort
• Develops with palpitations
• Occurs with rapid weight gain
• Begins after starting a new medication
• Is associated with known heart disease
• Has no clear explanation

How Are Swollen Legs Evaluated?

Dr. Lim Do-Sun may review:

• When the swelling began
• Whether one or both legs are affected
• Changes throughout the day
• Breathing symptoms
• Weight changes
• Heart and kidney history
• Current medications
• Salt and fluid intake
• Previous blood clot history
• Recent travel or prolonged inactivity

The examination may include checking the heart, lungs, blood pressure, leg circulation, skin changes, and the degree of edema.

Tests for Leg Swelling and Edema

Echocardiogram

An echocardiogram evaluates heart structure, pumping function, heart valves, and pressure-related changes that may contribute to fluid buildup.

Electrocardiogram

An ECG may identify abnormal heart rhythms, cardiac strain, or other electrical changes.

Blood Tests

Blood testing may assess:

• Kidney function
• Liver function
• Electrolytes
• Thyroid function
• Anemia
• Heart-related biomarkers
• Other possible causes of fluid retention

Vascular Ultrasound

An ultrasound may be recommended when a blood clot, vein obstruction, or venous circulation problem is suspected.

Chest Imaging

Chest imaging may help identify heart enlargement, fluid in the lungs, or other causes of breathing difficulty and swelling.

Medication-Related Edema

Certain medications may contribute to ankle or leg swelling, including some:

• Blood pressure medications
• Anti-inflammatory drugs
• Hormonal medications
• Diabetes medications
• Steroid medications

Patients should not stop prescribed medication without medical guidance. The doctor may review the medication and consider an alternative when appropriate.

Treatment for Swollen Legs

Treatment depends on the underlying cause and may include:

• Treating the heart or circulation condition
• Adjusting medication
• Reducing excessive salt intake
• Regular walking and movement
• Elevating the legs
• Compression stockings when medically appropriate
• Weight management
• Managing kidney, liver, or thyroid conditions
• Diuretic medication in selected patients

Diuretics are not suitable for every type of swelling and should be used only under medical supervision.

When Is Leg Swelling an Emergency?

Seek urgent medical care for:

• Sudden one-sided leg swelling
• Leg pain, redness, or warmth
• Sudden shortness of breath
• Chest pain
• Coughing up blood
• Fainting
• Severe breathing difficulty
• Rapidly worsening swelling
• Swelling with confusion or extreme weakness

These symptoms may indicate a blood clot, pulmonary embolism, heart failure, or another serious condition.

Edema Evaluation for International Patients

Dr. Lim Do-Sun Cardiovascular Clinic welcomes international patients, expatriates, tourists, and overseas residents seeking evaluation for unexplained leg swelling in Seoul.

Patients may bring:

• Previous blood test results
• Medication lists
• ECG or echocardiogram reports
• Vascular ultrasound results
• Weight and blood pressure records
• Previous cardiology or internal medicine reports

Why Choose Dr. Lim Do-Sun Heart Clinic?

The clinic provides:

• Cardiologist-led edema assessment
• Heart failure evaluation
• Echocardiography
• ECG testing
• Cardiovascular risk assessment
• Medication review
• Personalized treatment planning
• International patient support

Book a Swollen Legs and Edema Evaluation in Seoul

Persistent swollen legs should not be ignored, especially when accompanied by shortness of breath, fatigue, rapid weight gain, or other heart-related symptoms.

Dr. Lim Do-Sun Cardiovascular Clinic provides comprehensive evaluation for edema, heart conditions, and circulation-related causes of leg swelling in Seoul, Korea.

Frequently Asked Questions

Can heart problems cause swollen legs?

Yes. Heart failure and certain heart valve conditions may cause fluid to accumulate in the ankles and legs.

Why are my ankles more swollen at night?

Gravity can cause fluid to collect in the lower legs during the day, especially after prolonged standing or sitting.

Is swelling in one leg dangerous?

Sudden one-sided swelling can be a warning sign of a blood clot, particularly when accompanied by pain, warmth, or redness.

Can blood pressure medication cause ankle swelling?

Yes. Some blood pressure medications may cause ankle edema. A doctor can review whether medication is contributing to the swelling.

Will an echocardiogram show why my legs are swollen?

An echocardiogram can identify heart-related causes, including reduced pumping function and significant heart valve disease.

Should I take a diuretic for swollen legs?

Not without medical advice. Diuretics may help certain causes of fluid retention but may be ineffective or inappropriate for others.

Can eating too much salt cause edema?

High salt intake can contribute to fluid retention and may worsen swelling, particularly in patients with heart, kidney, or blood pressure conditions.