What is thrombosis?

The formation of a blood clot (thrombus) within a blood vessel is known as thrombosis. When a thrombus is formed, it prevents the normal flow of blood through the blood vessel.
Normal blood clot formation to stop bleeding is an important process, but when a blood clot is formed at a wrong place and at the wrong time, it may cause major health issues – such as venous thromboembolism, pulmonary embolism and atherothrombosis, which can cause stroke and heart attack.

Pulmonary thrombosis: When a blood clot breaks off and travel to the lungs, it blocks blood flow to the lungs and damages the lungs (pulmonary embolism or pulmonary thrombosis).
Symptoms of pulmonary embolism: If you experience chest pain, sudden shortness of breath, rapid or irregular heartbeat, coughing up blood, you must seek immediate medical attention.

When a blood clot forms in a major vein in the leg, it blocks the normal flow of blood through the vein (Deep Vein Thrombosis -DVT).

Symptoms of Deep Vein thrombo-embolism: The symptoms include pain, discolouration, and swelling of the leg.