Thrombosis is a disease, in which blood clots are formed in the blood vessels, without any bleeding. Such a clot is called a ‘thrombus’. Thrombosis has the effect that the blood vessel is entirely or partially closed. Thrombosis in a vein can cause deep vein thrombosis in the leg or pulmonary embolism. Thrombosis in an artery can lead to a heart attack or cerebral infarction.


Risk factors for thrombosis in a vein (venous thrombosis) are:

Risk factors for thrombosis in an artery (arterial thrombosis) are:


The signs and symptoms are partly dependent on the impact of the thrombosis:


The diagnosis of deep vein thrombosis is made on the basis of the following examinations:


The main purpose of the treatment of thrombosis is the prevention of serious consequences and ensure that the clot doesn’t grow further. The treatment includes:


If anyone had thrombosis before, there is a greater chance of getting it again. Thrombosis may come back in the same place, but also in a different vein. Some people keep suffering from pain, swelling in the leg and a colored skin.


The following precautions are important to prevent thrombosis in the future: