Blood Clots Don't Just Happen After Surgery

Every so often, we hear heartbreaking stories of someone who underwent what seemed like a routine medical procedure, appeared to be recovering well, then suddenly became seriously ill.

While the exact cause should never be assumed without medical evidence, one possible explanation in some cases is Deep Vein Thrombosis (DVT)—a blood clot that forms deep within the veins, usually in the legs.

Most blood clots remain where they form. However, if part of the clot breaks away, it can travel through the bloodstream to the lungs, causing a Pulmonary Embolism (PE)—a medical emergency that can be life-threatening.

Although uncommon, DVT is something everyone should be aware of because it is not limited to surgery.

It can happen after prolonged inactivity, long-distance travel, illness, injury, or any situation where blood circulation slows significantly.

The good news?

Many cases are preventable.

And prevention often starts with something surprisingly simple:

Movement.

What Is Deep Vein Thrombosis (DVT)?

Deep Vein Thrombosis (DVT) occurs when a blood clot develops inside one of the body's deep veins, most commonly in the calf or thigh.

Our circulatory system relies on movement to keep blood flowing efficiently.

Every step we take activates the calf muscles, often called the body's "second heart." These muscles squeeze the veins and help pump blood back toward the heart.

When we stop moving for long periods, blood flow slows.

Slower blood flow creates an environment where clots are more likely to develop.

DVT Can Happen in More Situations Than Most People Realize

Many people think blood clots only occur after major surgery.

In reality, DVT can develop in many different situations, including:

Any medical or surgical procedure
Long periods of bed rest
Recovery from illness or injury
Fractures requiring immobilization
Long-haul flights
Extended car journeys
Sitting at a desk for many hours without getting up
Frequent business travel

The common factor isn't the procedure.

It's prolonged immobility.

Our bodies were designed to move.

When movement stops, circulation slows.

When circulation slows, the risk of clot formation increases.

Why Long Flights Increase the Risk

Air travel itself doesn't directly cause blood clots.

The bigger issue is remaining seated for many hours with very little leg movement.

When you're sitting in an airplane seat:

Your knees remain bent.
Your calf muscles barely contract.
Blood pools more easily in the legs.
Cabin dehydration may contribute to thicker blood in some individuals.

For most healthy people, this isn't a problem.

But when combined with other risk factors—such as recent procedures, older age, smoking, obesity, pregnancy, or a previous history of blood clots—the risk becomes higher.

That's why many doctors encourage travellers to move regularly during long flights.

Who Is at Higher Risk?

Anyone can develop DVT, but the risk is greater if you have:

Previous DVT or pulmonary embolism
Recent hospitalization or medical procedure
Cancer
Pregnancy or the weeks after childbirth
Smoking
Obesity
Hormonal medications containing estrogen
Inherited clotting disorders
Older age
Prolonged immobilization
Frequent long-distance travel

Having one or more of these risk factors doesn't mean you will develop a clot.

It simply means being proactive becomes even more important.

Awareness Is the First Step to Prevention

One lesson our family has adopted is simple:

Movement is not optional—it is part of staying healthy.

My wife travels overseas frequently, and many of her trips involve long-haul flights. Whenever she lands—whether at her hotel or back home—she takes just a few minutes to perform simple circulation exercises before unpacking or settling in. It isn't because she's unwell or fearful. It's simply a habit she's developed to encourage healthy blood flow after spending many hours sitting.

It's a small routine, but one that reflects a larger principle:

Taking care of your health shouldn't begin only after a problem arises.

Building simple daily habits—especially after long periods of sitting—helps keep your circulation active and your body functioning the way it was designed to.

Sometimes prevention doesn't require expensive equipment or complicated routines.

Sometimes it begins with simply getting up and moving.

Simple Exercises to Encourage Healthy Circulation

If your doctor has cleared you to move, these gentle exercises can help improve circulation after long periods of sitting. The National Blood Clot Alliance recommends moving at least once every hour during prolonged sitting or travel.

1. Ankle Pumps

Keep your heels on the floor.

Lift your toes toward your shins.

Then point your toes downward.

Repeat 20–30 times.

This activates the calf muscles, which help pump blood back toward the heart.

2. Seated Marches

Lift one knee slowly toward your chest.

Lower it gently.

Alternate sides.

Repeat 10–20 times.

3. Heel Raises and Toe Raises

With both feet flat on the floor:

Lift your toes while keeping your heels on the ground.
Then lift your heels while keeping your toes on the floor.

Hold each position for 5 seconds.

Repeat 10 times.

4. Knee Lifts

Sit upright.

Lift one knee slightly.

Hold for 5 seconds.

Repeat 10 times on each side.

5. Gentle Walking

If medically appropriate, take a 5–10 minute walk several times throughout the day.

Walking remains one of the most effective ways to improve circulation.

6. Hand and Finger Flicks

Open and close your hands rapidly or flick your fingers for 10–20 seconds.

Although simple, these movements help reduce stiffness during prolonged sitting.

7. Overhead Arm Stretch

Raise both arms overhead.

Interlock your fingers.

Stretch upward with palms facing forward for 5 seconds.

Then rotate your palms upward and stretch again.

Repeat 10 times.

8. Shoulder Rolls

Roll both shoulders forward 10 times.

Then backward 10 times.

9. Gentle Neck Rotation

Slowly turn your neck clockwise.

Then counter-clockwise.

Repeat 10 times in each direction.

Move gently and never force the movement.

Warning Signs You Should Never Ignore

Seek immediate medical attention if you notice:

Possible Deep Vein Thrombosis (DVT)

Swelling in one leg
Calf pain or tenderness
Warmth over the affected area
Redness or skin discoloration

Possible Pulmonary Embolism (PE)

Sudden shortness of breath
Chest pain
Rapid heartbeat
Coughing up blood
Fainting
Sudden collapse

These symptoms require immediate emergency medical care.

The Bigger Picture

Modern medicine has made surgery and medical procedures safer than ever before.

Most people recover without experiencing serious complications.

However, our health doesn't depend solely on what happens in the operating room or clinic.

It also depends on the small decisions we make every day.

Getting up from your desk.

Walking during a long flight.

Stretching after hours in the car.

Moving after arriving at your hotel.

Taking a short walk before settling in at home.

These simple habits may seem insignificant, but over time they become powerful investments in your long-term health.

Your body was designed to move.

The more consistently we respect that design, the healthier our circulation, muscles, joints, and overall wellbeing become.

Key Takeaways

✅ Deep Vein Thrombosis (DVT) is an uncommon but potentially serious condition that can affect anyone.

✅ Blood clots are not limited to surgery—they can also occur after prolonged sitting, illness, injury, or long-distance travel.

✅ Frequent travellers should make regular movement part of every journey.

✅ Gentle circulation exercises after long flights or extended sitting are simple habits that support healthy blood flow.

✅ Know the warning signs of DVT and Pulmonary Embolism, and seek immediate medical attention if they occur.

✅ The best prevention often begins with awareness, movement, and caring for your health before problems develop.

Medical Disclaimer

This article is intended for educational purposes only and should not replace professional medical advice. If you have a history of blood clots, have recently undergone a medical procedure, or have been diagnosed with Deep Vein Thrombosis (DVT), consult your physician or healthcare provider before starting any exercise program. If you experience sudden shortness of breath, chest pain, fainting, or swelling in one leg, seek emergency medical attention immediately.

Blood Clots: The Hidden Risk After Travel, Procedures & Sitting