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A deep vein thrombosis (DVT) is a blood clot that forms in a deep vein. If not treated, a part of the clot (embolus) can travel to the lungs and cause a life-threatening complication. Over time, the clot can also permanently damage leg veins. To protect your health, DVT must be treated right away.
Anyone can get deep vein thrombosis. But the following risk factors make the condition more likely to occur:
Being inactive for a long period (such as when you’re bedridden due to illness)
Injury to a vein
Family history of blood clots
Other factors such as age, pregnancy, having another vein problem, or being overweight can also put you at higher risk of DVT.
DVT does not always cause obvious symptoms. If you do have symptoms, they usually occur suddenly and in only one leg. Symptoms can include:
Pain, especially deep in the muscle
Aching or tenderness
Red or warm skin
The leg muscles have deep veins. These help carry blood from the legs to the heart. When leg muscles contract and relax, blood is squeezed up the veins toward the heart. One-way valves located along the walls of the veins help keep blood moving upward. When blood moves too slowly or not at all, it can pool in the veins. This makes a clot more likely to form.
Your doctor will evaluate your veins to see if you have a blood clot. This includes taking a health history and performing a physical exam. During the health history, tell the doctor if your family has a history of vein problems and if you’ve had any blood clots, leg injuries, recent surgical procedures, or pregnancies. An imaging test called a duplex ultrasound will also be done. This test uses sound waves to create pictures of vein structures and blood flow. It helps the doctor pinpoint the size and location of a blood clot, if you have one. After the evaluation, your doctor will discuss treatment options with you.