An embolus is a substance that travels through the bloodstream and can cause a blockage in a blood vessel. This blockage can disrupt blood flow to vital organs, leading to serious health issues. Common types of emboli include blood clots, air bubbles, and fat droplets. When an embolus lodges in a blood vessel, it can result in conditions such as a pulmonary embolism or a stroke. The severity of the effects depends on the size of the embolus and the location of the blockage. Prompt medical attention is crucial to manage the risks associated with an embolus.