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   Transient Ischemic Attack (TIA)-Cause   
      
      
   Transient Ischemic Attack (TIA) - Cause   
   Blood clots that temporarily block blood flow to the brain are the most common   
   cause of transient ischemic attacks (TIAs). Blood clots may develop for a   
   variety of reasons.   
      
   A blood clot can form in an artery that supplies blood to the brain.   
   Blood clots usually form in arteries damaged by plaque buildup, which is a   
   process called atherosclerosis. High blood pressure may damage arteries   
   camera.gif and cause plaque to build up.   
   Long-standing high blood pressure or diabetes may damage smaller blood vessels   
   in the brain, causing a clot to form within the blood vessels and block blood   
   flow.   
   A blood clot can form in another part of the body (often the heart) and travel   
   through the bloodstream to an artery that supplies blood to the brain. For   
   example, clots may form:   
   After a heart attack.   
   As a result of other conditions that alter how blood flows through the heart.   
   These conditions include abnormal heart rhythms (especially atrial   
   fibrillation), heart valve problems, patent foramen ovale, atrial septal   
   defects, and heart failure.   
   Also, an artery that is partially blocked with plaque can reduce blood flow to   
   the brain and cause symptoms.   
      
   Rare causes of blood clots that can cause a TIA include:   
      
   Clumps of bacteria, tumor cells, or air bubbles that move through the   
   bloodstream.   
   Conditions that cause blood cells to stick together. For example, having too   
   many red blood cells (polycythemia), abnormal clotting factors, or abnormally   
   shaped red blood cells, such as those caused by sickle cell disease, may cause   
   blood clots to form.   
   Inflammation in the blood vessels, which may develop from conditions such as   
   syphilis, tuberculosis, or other inflammatory diseases.   
   A head or neck injury that results in damage to blood vessels in the head or   
   neck.   
   A tear in the wall of a blood vessel located in the neck.   
   WebMD Medical Reference from Healthwise   
      
   This information is not intended to replace the advice of a doctor. Healthwise   
   disclaims any liability for the decisions you make based on this information.   
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