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A serious complication associated with deep vein thrombosis is pulmonary embolism.

Pulmonary embolism
A pulmonary embolism occurs when a blood vessel in your lung becomes blocked by a blood clot (thrombus) that travels to your lung from another part of your body, usually your leg.

A pulmonary embolism can be life-threatening. It's important to watch for signs and symptoms of a pulmonary embolism and seek medical attention if they occur. Signs and symptoms of a pulmonary embolism include:

Sudden shortness of breath
Chest pain or discomfort that worsens when you take a deep breath or when you cough
Feeling lightheaded or dizzy, or fainting
Rapid pulse
Coughing up blood

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Blood thinners. Deep vein thrombosis is most commonly treated with anticoagulants, also called blood thinners. These drugs, which can be injected or taken as pills, decrease your blood's ability to clot. They don't break up existing blood clots, but they can prevent clots from getting bigger and reduce your risk of developing more clots.The injectable medications can be given as a shot under the skin or by injection into your arm vein. Clot busters. These drugs can cause serious bleeding, so they're generally reserved for severe cases of blood clots.

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Deep vein thrombosis signs and symptoms can include:

Swelling in the affected leg. Rarely, there's swelling in both legs.

Pain in your leg. The pain often starts in your calf and can feel like cramping or soreness.

Red or discolored skin on the leg.

A feeling of warmth in the affected leg.

Deep vein thrombosis can occur without noticeable symptoms.

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Prognosis is generally good with prompt, adequate treatment. Common long-term complications include venous insufficiency with or without the postphlebitic syndrome. Whether a DVT is provoked or idiopathic is a significant determinant of recurrence. The extent and location of the initial clot influence the risk of post-thrombotic syndrome (also known as post-phlebitic syndrome), which is the major sequels of DVT. Deep venous thrombosis seldom alters the overall prognosis of the patient; the presence or absence of an underlying malignancy, and the presence or absence of underlying medical co morbidity, such as liver disease or chronic kidney disease, remain the major prognostic determinants among DVT patients.

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Deep vein thrombosis occurs when a blood clot  forms in one or more of the deep veins in your body, usually in your legs. Deep vein thrombosis can develop if you have certain medical conditions that affect how your blood clots. It can also happen if you don't move for a long time, such as after surgery or an accident, or when you're confined to bed.