Phlegmasia Cerulea Dolens: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Phlegmasia Cerulea Dolens?
A vascular specialist usually leads care for this condition. Because it is a medical emergency, emergency room doctors often start treatment first. Some people also need an interventional radiologist, a doctor who uses imaging tools to treat clots inside the body.
What it is
Phlegmasia cerulea dolens is a rare and serious condition. It happens when a large blood clot blocks the deep veins, most often in the leg. When blood cannot drain out of the leg, it pools there, and the leg can swell badly and turn blue or purple.
This condition is a medical emergency. Without fast treatment, it can lead to tissue death or loss of the limb. It can also cause a pulmonary embolism, a clot that travels to the lungs.
Symptoms
The main signs are sudden swelling, severe pain, and a blue or purple color in one leg. The leg may also feel cold, heavy, or hard to the touch. Blisters or skin ulcers can appear in serious cases, and some people develop a fever.
Causes and who gets it
The cause is a large clot in the deep veins, often on top of an existing deep vein thrombosis. It is more common in people with cancer, recent surgery, pregnancy, or inherited clotting disorders. Being unable to move for long periods, such as during long bed rest, also raises the risk.
How doctors diagnose it
Doctors start with an exam and ask about symptoms and risk factors. An ultrasound of the leg is the main test used to find the clots.
Treatment
Treatment usually starts with blood thinners given through a vein or by injection. Many people also need a procedure to remove or dissolve the clot, done by a vascular specialist or interventional radiologist. In severe cases, surgery may be needed.
When to see a doctor
Go to the emergency room right away if one leg becomes suddenly painful, swollen, and blue or purple. Also seek emergency care for sudden shortness of breath or chest pain, which can mean a clot has moved to the lungs. Do not wait to see if symptoms improve on their own.
If you have leg swelling or pain that is milder but new for you, see a doctor the same day.
What kind of doctor treats it
Emergency doctors usually begin care. Vascular surgeons or vascular medicine specialists take over from there. Some patients are treated by interventional radiologists who perform clot-removal procedures. After leaving the hospital, many people keep seeing a hematologist.
Common questions
Is phlegmasia cerulea dolens the same as a regular blood clot?
No. A regular deep vein thrombosis blocks part of a vein. This condition blocks so much flow that the whole leg is affected. That is why it is far more dangerous.
Can it happen in both legs at once?
It can, but this is rare. Most cases affect only one leg.
Will the leg return to normal?
Results differ from person to person. Some people recover well. Others have lasting swelling or skin changes because the veins were damaged.
How can I lower my risk?
Moving regularly helps prevent clots, especially after surgery or long travel. Follow your doctor's advice about blood thinners if you have a high risk of clotting.
Sources
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
