See also: List of states and territories of the United States. This table includes abbreviations for three independent nations related to the United States through Compacts of Free Association, and other comparable postal abbreviations, including those now obsolete. Codes and abbreviations for U.S. states, territories and other regions.
Pulmonary embolism is the sudden blockage of a major blood vessel (artery) in the lung, usually by a blood clot . In most cases, the clots are small and are not deadly, but they can damage the lung. But if the clot is large and stops blood flow to the lung, it can be deadly.
Causes of Blood Clots in Lungs. Blood clots happen when a mass of material, most often a clot of blood, becomes wedged into an artery of the lungs. These clots frequently develop in the veins deep in the legs, however they may also originate from other areas of the body.