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occurs when a blood clot (thrombus) forms in one or more of the deep veins in your body, usually in your legs. Deep Vein Thrombosis can cause leg pain or swelling, but also can occur with no symptoms.
Deep Vein Thrombosis develops if you have medical conditions as it can affect your blood clot. Blood clots occur when blood thickens and clumps together. Most deep vein blood clots occur in the lower leg or thigh. They also can occur in other parts of the body which in simple words is a clot deep within a vein

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Deep vein thrombosis (DVT) treatment is aimed at preventing the clot from getting bigger and preventing it from breaking loose and causing a pulmonary embolism. Then the goal becomes reducing your chances of deep vein thrombosis happening again.

Deep vein thrombosis treatment options include:

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.

Clot busters. If you have a more serious type of deep vein thrombosis or pulmonary embolism, or if other medications aren't working, your doctor might prescribe drugs that break up clots quickly, called clot busters or thrombolytics.

Filters. If you can't take medicines to thin your blood, you might have a filter inserted into a large vein — the vena cava — in your abdomen. A vena cava filter prevents clots that break loose from lodging in your lungs.

Compression stockings. To help prevent swelling associated with deep vein thrombosis, these are worn on your legs from your feet to about the level of your knees.

This pressure helps reduce the chances that your blood will pool and clot. You should wear these stockings during the day for at least two years, if possible.

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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.

Chest pain

Trouble breathing or sudden shortness of breath

Coughing (may cough up blood)

Fainting

Fast heartbeat

Sweating

You may have bleeding if you take medicine to help prevent blood clots.

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Complications from deep vein thrombosis can be very serious. They can include pulmonary embolism , chronic venous insufficiency, and post-thrombotic syndrome. You may hear healthcare providers use the term venous thromboembolism  to describe DVT and PE.

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Deep vein thrombosis has he extent and location of the initial clot influence the risk of post-thrombotic syndrome also known as post-phlebitic syndrome, which is the major sequela 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 comorbidity, such as liver disease or chronic kidney disease, remain the major prognostic determinants among DVT patients. People with cancer have reduced survival rates compared to people without cancer. When a patient dies from DVT, it is usually from pulmonary embolus or from a major hemorrhage as a complication of the anticoagulation therapy.