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
tuberculosis, or other inflammatory
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.