Don't Ignore Persistent Ankle Swelling—Know When to See a Doctor

Persistent swelling in the legs and ankles may signal more than fatigue—nutrition could play an important role.

Swollen feet, ankles, and lower legs are a common complaint, especially among older adults, people who stand or sit for long periods, and those with certain medical conditions. While swelling (edema) can sometimes be caused by heart, kidney, or liver disease, it is often linked to fluid retention, poor circulation, excessive sodium intake, or nutritional imbalances.

One nutrient that has attracted attention for its role in maintaining proper fluid balance is potassium. Working together with sodium, potassium helps regulate the body's water balance and supports normal muscle and nerve function. Understanding how this mineral works may help explain why adequate intake is important for people dealing with mild fluid retention.

Why Do Legs and Ankles Swell?

Edema occurs when excess fluid accumulates in the body's tissues. Several factors can contribute to this condition, including:

• Standing or sitting for long periods

• Poor blood circulation

• Excess sodium intake

• Certain medications

• Pregnancy

• Venous insufficiency

• Heart, kidney, or liver disorders

Because swelling has many possible causes, persistent or severe edema should always be evaluated by a healthcare professional.

The Role of Potassium

Potassium is an essential mineral that helps maintain normal fluid balance inside and outside the body's cells.

It works alongside sodium through the sodium-potassium pump, a cellular mechanism responsible for:

• Regulating water movement

• Supporting healthy nerve signals

• Maintaining muscle contractions

• Helping control blood pressure

When sodium intake is high but potassium intake is low, the body may retain more water, contributing to swelling in some individuals.

Foods Rich in Potassium

Instead of relying on supplements without medical advice, experts recommend increasing potassium naturally through food whenever appropriate.

Excellent sources include:

• Bananas

• Sweet potatoes

• Spinach

• Avocados

• White beans

• Lentils

• Tomatoes

• Yogurt

• Oranges

• Salmon

Eating a balanced diet rich in fruits and vegetables can help support normal electrolyte balance.

Other Ways to Reduce Mild Swelling

Nutrition is only one part of the solution. Lifestyle habits can also make a significant difference.

Helpful strategies include:

Stay Hydrated

Drinking enough water helps your body maintain a healthy fluid balance and may reduce unnecessary water retention.

Reduce Excess Salt

Highly processed foods often contain large amounts of sodium, which may worsen fluid retention in susceptible individuals.

Move More Often

Walking, stretching, or simply standing up every hour helps improve circulation, especially if you spend much of the day sitting.

Elevate Your Legs

Raising your legs above heart level for short periods may encourage fluid to move back toward the heart.

Wear Compression Stockings

For people with chronic venous insufficiency, compression garments may help reduce swelling after consulting a healthcare provider.

When Should You See a Doctor?

Seek medical attention promptly if leg swelling:

• Appears suddenly

• Affects only one leg

• Is accompanied by severe pain

• Comes with chest pain or shortness of breath

• Is associated with fever or skin redness

• Persists despite lifestyle changes

These symptoms may indicate a more serious underlying condition that requires immediate evaluation.

The Bottom Line

Potassium plays an important role in maintaining healthy fluid balance and may help reduce mild water retention when combined with a balanced diet and healthy lifestyle. However, swollen legs and ankles are not always caused by nutritional deficiencies.

If swelling is frequent, worsening, or accompanied by other concerning symptoms, it's essential to seek medical advice rather than relying solely on dietary changes. Identifying the underlying cause is the key to effective treatment.