Causes of thrombosis include damage to the endothelium of blood vessels and abnormal blood flow status, increased platelet levels in the body, etc. It may also be caused by some predisposing factors, such as poor dietary habits or insufficient activity. 1. Vascular endothelial damage: including rheumatic and infective endocarditis, atherosclerotic plaque rupture or hypoxia, shock, etc., causing widespread endothelial damage throughout the body, leading to thrombosis. 2. Altered blood flow status: including heart failure, aneurysm, slow blood flow at the branch of the blood vessel is prone to thrombus formation. 3. Increased platelet content in the body: may be caused by genetic factors, or suffering from lung cancer, pancreatic cancer, severe trauma. Thrombosis is associated with age, or sedentary behavior, and eating foods high in salt, sugar and fat. If you feel unwell, you should go to the hospital in time, under the guidance of the physician, to identify the cause and then give targeted treatment.