1. Deep Vein Thrombosis Slideshow Pictures
2. Take the Blood Disorders Quiz
3. Spider & Varicose Veins Slideshow Pictures

Medical Author:

Benjamin Wedro, MD, FACEP, FAAEM

Benjamin Wedro, MD, FACEP, FAAEM

Dr. Ben Wedro practices emergency medicine at Gundersen Clinic, a regional trauma center in La Crosse, Wisconsin. His background includes undergraduate and medical studies at the University of Alberta, a Family Practice internship at Queen's University in Kingston, Ontario and residency training in Emergency Medicine at the University of Oklahoma Health Sciences Center.

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Medical Editor:

Melissa Conrad Stöppler, MD

Melissa Conrad Stöppler, MD

Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.

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In this Article

• Introduction to deep vein thrombosis
• What are the causes of deep vein thrombosis?
• What are the symptoms of deep vein thrombosis?
• When should I seek medical care for deep vein thrombosis?
• How is deep vein thrombosis diagnosed?
• What is the treatment for deep vein thrombosis?
• What are the complications of deep vein thrombosis?
• Can deep vein thrombosis be prevented?
• Deep Vein Thrombosis - Slideshow
• Take the Blood Disorders Quiz!
• Spider & Varicose Veins - Slideshow
• Patient Comments: Deep Vein Thrombosis - Diagnosis
• Patient Comments: Deep Vein Thrombosis - Symptoms
• Find a local Cardiologist in your town
• Deep Vein Thrombosis Index

Superficial thrombophlebitis

Blood clots in the superficial vein system most often occur due to trauma to the vein which causes a small blood clot to form. Inflammation of the vein and surrounding skin causes the symptoms of any other type of inflammation including:

• redness,
  
  
• warmth,
  
  
• tenderness, and
  
  
• swelling.

Often the affected vein can be palpated (felt) as a firm, thickened cord. There may be inflammation that follows the course of part of the vein.

Although there is inflammation, there is no infection.

Varicosities can predispose to superficial thrombophlebitis. When the valves of the larger veins in the superficial system fail (the greater and lesser saphenous veins), blood can back up and cause the veins to swell and become distorted or tortuous. The valves fail when veins lose their elasticity and stretch. This can be due to age, prolonged standing, obesity, pregnancy, and genetic factors.

Deep Venous Thrombosis

The symptoms of deep vein thrombosis are related to obstruction of blood returning to the heart and causing a backup of blood in the leg. Classically, they symptoms include:

• pain,
  
  
• swelling,
  
  
• warmth, and
  
  
• redness.

Not all of these symptoms have to occur; one, all, or none may be present with a deep vein thrombosis. The symptoms may mimic an infection or cellulitis of the leg.

Historically, healthcare providers would try to elicit a couple of clinical findings to make a diagnosis. Dorsiflexion of the foot (pulling the toes towards the nose, or Homans' sign) and Pratt's sign (squeezing the calf to produce pain), have not been found effective in making a diagnosis.