Blood Clots Can block a blood vessel Also known as a thrombus or emboli

Diabetes Long term high blood sugar levels can damage blood vessels This can cause weakening and narrowing of the blood vessel Frequently have hypertension and hyperlipidemia which accelerates atherosclerosis

Inflammation of the arteries Arteritis causes narrowing and weakening of the arteries Vasculitis causes inflammatory injury and necrosis of the blood vessel wall

Infection Inflammation and scarring caused by infection can block, narrow, or weaken blood vessels Salmonellosis and syphilis are both known to infect and damage blood vessels

Structural Defects Defects can narrow a blood vessel Most cases are cause a birth Takayasu is a vascular disease affecting the upper vessels usually in Asian females

Injury Blood vessels can be injured in accidents such as auto accidents and falls.