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.
Certain diseases and conditions are more likely to cause clots to form in specific areas of the body. Conditions that can trigger excessive blood clotting in the heart and brain: 1  Atherosclerosis is a disease in which a waxy substance called plaque builds up inside your arteries.2  Over time, the plaque may rupture. 3  Platelets clump together to form clots at the site of the damage.any factors can lead to excessive blood clotting, leading to limited or blocked blood flow. Blood clots can travel to the arteries or veins in the brain, heart, kidneys, lungs and limbs, which in turn can cause heart attack, stroke, damage to the bodyâs organs or even death. 1  Smoking. 2  Overweight and obesity.