What is a thrombus? Causes

What is a thrombus? Causes 
Thrombus occurs when a blood clot remains and circulates in the vascular system. It may reach vital organs, and prevent blood vessels from functioning correctly.
A thrombus is a blood clot in the vascular system. It stays attached to the site where it was formed and hinder blood flow. Under these circumstances, a person is said to be experiencing a thrombosis.
A thrombus is a problem because it impedes the function of a blood vessel.
The effect of a thrombus on the body depends on its location. When a thrombus forms in an artery, such as in the heart or brain, it is called an arterial thrombosis. When a thrombus occurs in a vein, it is called a venous thrombosis. When this happens in the deep veins of the leg, it is called deep vein thrombosis 
Causes
Smoking tobacco may increase the risk of developing a thrombus.

Clotting is caused by chemical reactions between blood cells (platelets) and proteins. 

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