Swollen Feet and Ankles: When Is It Serious?

Most people experience swollen feet or ankles at some point in their lives. Whether after a long day at work, a lengthy flight, or during pregnancy, swelling in the lower limbs is a common complaint.

In many cases, swollen feet are temporary and harmless. However, persistent, recurring, or severe swelling can sometimes indicate an underlying health issue that requires medical attention.

Understanding why your feet are swelling can help you determine whether simple lifestyle changes are enough or whether it's time to seek professional advice.

At FootHealth Battersea, we regularly see patients concerned about swelling in their feet and ankles. While the cause is often straightforward, there are occasions when swelling may be a sign of a more serious condition.

What Causes Swollen Feet and Ankles?

Swelling occurs when excess fluid accumulates in the body's tissues. This is known medically as oedema.

Because your feet and ankles are the lowest part of your body, gravity can cause fluid to collect there more easily, particularly after long periods of sitting or standing.

Common causes of swollen feet and ankles include:

• Prolonged sitting or standing
• Pregnancy
• Hot weather
• Injuries
• Poor circulation
• Certain medications
• Underlying medical conditions

Sitting at a Desk All Day

Office workers are among the most common groups affected by swollen feet and ankles.

When you sit for extended periods, the muscles in your legs are less active. These muscles normally help pump blood and fluid back towards the heart.

Without regular movement, fluid can begin to pool in the lower limbs.

Signs this may be the cause include:

• Swelling that worsens throughout the day
• Improvement after walking or elevating the feet
• Mild discomfort rather than significant pain

Simple measures such as standing regularly, walking during breaks, and stretching can often help reduce swelling.

Long Flights and Travel

Many people notice swollen feet after travelling.

During long flights, car journeys, or train trips, prolonged sitting can slow circulation and encourage fluid retention.

Travel-related swelling is usually temporary and improves within a day or two.

To reduce swelling while travelling:

• Move regularly
• Flex and extend your ankles
• Stay hydrated
• Avoid crossing your legs for long periods
• Consider compression socks if recommended by a healthcare professional

Pregnancy and Swollen Feet

Swollen feet and ankles are extremely common during pregnancy, particularly during the third trimester.

Several factors contribute to swelling, including:

• Increased blood volume
• Hormonal changes
• Pressure from the growing uterus on blood vessels

Mild swelling is usually considered normal.

However, sudden or severe swelling, particularly if accompanied by headaches, vision changes, or high blood pressure, should be assessed urgently as it may indicate pregnancy-related complications.

Injury and Inflammation

A foot or ankle injury often causes swelling as part of the body's natural healing response.

Common examples include:

• Sprains
• Strains
• Fractures
• Tendon injuries

Signs that swelling may be injury-related include:

• Pain
• Bruising
• Difficulty bearing weight
• Reduced range of motion

Persistent swelling following an injury should be professionally assessed.

Poor Circulation

Circulation problems can contribute to swelling in the feet and ankles.

When blood flow through the veins becomes less efficient, fluid may accumulate in the lower limbs.

People with circulation issues may also notice:

• Heavy legs
• Aching calves
• Varicose veins
• Skin changes around the ankles
• Swelling that worsens later in the day

Ageing and Swollen Feet

As we age, changes in circulation, muscle function, and blood vessel health can increase the likelihood of swelling.

Older adults may be more susceptible to fluid retention, particularly if they:

• Spend long periods sitting
• Have reduced mobility
• Take medications that affect circulation
• Have underlying health conditions

Persistent swelling should never be dismissed simply as a normal part of ageing.

Medications That Can Cause Swelling

Certain medications are known to cause swelling in the feet and ankles.

Examples include:

• Some blood pressure medications
• Steroids
• Hormonal treatments
• Certain diabetes medications
• Anti-inflammatory drugs

If swelling develops shortly after starting a new medication, it is worth discussing with your healthcare provider.

When Swelling May Be a Sign of Something More Serious

Although many cases are harmless, swelling can occasionally indicate a more significant medical issue.

Conditions associated with swelling include:

• Heart disease
• Kidney disease
• Liver disease
• Venous insufficiency
• Blood clots
• Lymphatic disorders

These conditions often require prompt medical evaluation and treatment.

When Should You Seek Medical Advice?

You should seek professional advice if swelling:

• Persists for several weeks
• Continues to worsen
• Occurs frequently without an obvious cause
• Is accompanied by pain
• Affects only one leg
• Causes skin changes
• Is associated with numbness or tingling
• Interferes with walking

When Is Swelling an Emergency?

Urgent medical attention should be sought if swelling is accompanied by:

• Chest pain
• Difficulty breathing
• Sudden swelling in one leg
• Severe pain
• Redness and warmth in the calf
• Signs of infection

These symptoms may indicate a serious medical condition requiring immediate assessment.

How Can You Reduce Swelling in Your Feet?

Depending on the cause, several strategies may help reduce swelling.

Keep Moving

Regular walking encourages healthy circulation and helps prevent fluid from pooling in the lower limbs.

Elevate Your Feet

Raising your feet above heart level can help fluid drain more effectively.

Stay Hydrated

Adequate hydration supports healthy circulation and fluid balance.

Wear Supportive Footwear

Proper footwear can improve comfort and reduce strain on the feet and ankles.

Manage Underlying Health Conditions

Conditions such as diabetes, circulation disorders, and cardiovascular disease should be appropriately managed.

How Can a Podiatrist Help?

A podiatrist can assess swelling alongside other symptoms affecting the feet and lower limbs.

During an assessment, they may evaluate:

• Circulation
• Foot structure and biomechanics
• Skin health
• Sensation and nerve function
• Footwear choices
• Signs of underlying lower limb conditions

Where necessary, further medical investigations may be recommended.

Frequently Asked Questions

Why are my feet swelling for no reason?

There is usually an underlying cause, even if it is not immediately obvious. Common reasons include prolonged sitting, travel, pregnancy, medication side effects, and circulation problems.

Are swollen feet a sign of poor circulation?

They can be. Poor circulation is one of several possible causes of swelling in the feet and ankles.

Should I worry about swollen ankles?

Occasional mild swelling is often harmless. However, persistent, worsening, or unexplained swelling should be professionally assessed.

Can dehydration cause swollen feet?

In some cases, dehydration may contribute to fluid retention as the body attempts to conserve fluids.

Is swelling in one foot more concerning?

Swelling affecting only one foot or leg may require more urgent assessment, particularly if it develops suddenly or is associated with pain.

Book a Foot Health Assessment

If you're experiencing persistent swelling in your feet or ankles, professional assessment can help identify the underlying cause and provide appropriate advice.

At FootHealth Battersea, we help patients understand symptoms affecting their feet and lower limbs and provide tailored recommendations to support long-term foot health.