Tuesday, April 21st, 2026

Post-thrombotic syndrome (PTS) is a chronic vascular condition that can develop after deep vein thrombosis (DVT)—a serious type of blood clot that forms in the deep veins, most often in the legs. Post-thrombotic syndrome symptoms typically affect the lower extremities and may interfere with daily activities, mobility, and overall quality of life.

Post-thrombotic syndrome occurs when a previous blood clot damages the veins or vein valves, making it harder for blood to flow efficiently back to the heart. While not everyone who experiences DVT will develop PTS, the condition is a known long-term complication, especially when vein damage is present or underlying vein disease exists.

USA Vein Clinics, our experienced vein specialists focus on identifying and treating vein conditions early to help reduce the risk of complications such as post-thrombotic syndrome.

DVT Information

What Causes Post-Thrombotic Syndrome?

The primary cause of post-thrombotic syndrome is damage from a previous DVT. When veins or valves are weakened, they struggle to accommodate changes in blood flow—especially during physical activity.

As circulation becomes compromised, pressure builds in the legs, leading to symptoms such as pain, swelling, and skin changes. Over time, untreated PTS may progress to more serious complications, including:

Chronic leg swelling
Skin discoloration or thickening
Venous ulcers that are slow to heal

In advanced cases, severe vein blockage can significantly reduce blood flow, increasing the risk of serious tissue damage. Early evaluation by an expert vein specialist is critical to help prevent disease progression.

Post-Thrombotic Syndrome Symptoms

Many post-thrombotic syndrome symptoms are similar to symptoms of vein disease. Most commonly, the legs are impacted.

Signs of PTS can include:

Tingling
Itching
Heaviness
Cramping
Aching
Swelling
Pain

PTS is not diagnosed through a test or scan, but through observation of symptoms and pre-existing conditions. If you have vein disease or DVT and experience any of the symptoms above, you may be suffering from post-thrombotic syndrome. However, it is important to consult an experienced specialist to determine what is going on with your individual situation.

Many people with PTS experience leg pain and swelling after long periods of sitting or standing. Physical activity, such as walking or stretching, can help alleviate pain or irritation and promote good blood circulation. To avoid unnecessary discomfort, we suggest getting help from a vein specialist when you first experience leg symptoms. Vein treatment may reduce your risk for developing PTS, painful, non-healing ulcers, and other dangerous conditions.

Post-Thrombotic Syndrome Risk Factors

There are a range of risk factors for post-thrombosis syndrome that are similar to those of vein disease and DVT. Some of these include:

Sitting or standing for prolonged periods of time
A recent injury or surgery, especially one requiring lengthy bed rest
Having a blood-clotting disorder or family history of these disorders
Smoking
Varicose veins
Cancer
Obesity
Pregnancy
Being over age 60
Underlying health conditions like high blood pressure and diabetes
Vein disease, or venous insufficiency

If you are at risk for DVT and PTS, we recommend close monitoring by a vein specialist. Individuals with underlying vein disease may benefit from treatment. If you are experiencing signs of DVT or PTS, seek medical evaluation as soon as possible.

Post-Thrombotic Syndrome Treatment Options

While post-thrombotic syndrome cannot always be reversed, treating underlying vein disease may help relieve symptoms and improve circulation. At USA Vein Clinics, treatment plans are personalized by expert vein specialists based on each patient’s condition, symptoms, and medical history.

Minimally invasive outpatient options may include:

Endovenous Laser Treatment (EVLT)
ClariVein®

These procedures are typically completed in under an hour and allow most patients to return to normal activities quickly. A consultation with an expert vein specialist can help determine whether treatment may be appropriate.

Our Vein Treatments

When to See a Vein Specialist

If you have a history of DVT or are experiencing ongoing leg pain, swelling, or discomfort, early evaluation is important. Prompt care may help reduce the risk of long-term complications, including non-healing ulcers and worsening venous disease.

If you experience symptoms of acute DVT or pulmonary embolism, seek emergency medical care immediately.

Medical Disclaimer

The information provided on this page is for educational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Post‑thrombotic syndrome and related vein conditions can vary from person to person, and symptoms may be caused by different underlying medical issues. Always seek the advice of a qualified healthcare provider or expert vein specialist with any questions you may have regarding a medical condition. Do not disregard or delay seeking medical care because of information you have read on this website. If you are experiencing symptoms of deep vein thrombosis (DVT), pulmonary embolism, or any medical emergency, call 911 or seek emergency medical care immediately.

Request a Consultation at USA Vein Clinics

If you’re experiencing symptoms of or are at risk for PTS our highly-experienced vein specialists are here to help. At USA Vein Clinics, we specialize in treating a variety of venous issues with minimally invasive, outpatient procedures.

Our team will work with you to develop a personalized plan for treatment and ongoing care. Our primary goal is to improve your vein health, so that you can experience a better quality of life. Schedule online now to visit us at one of our over 100 clinics nationwide or to see a specialist from the comfort of your home with a virtual visit.