An embolic stroke occurs when a blood clot or debris forms away from the brain, often in the heart, and travels through the bloodstream to block a blood vessel in the brain. This blockage prevents oxygen-rich blood from reaching brain tissue, leading to potential damage or death of brain cells. Common causes of an embolic stroke include atrial fibrillation, a heart condition that can cause irregular heartbeats, and atherosclerosis, where fatty deposits build up in arteries. Symptoms may include sudden weakness, difficulty speaking, or loss of coordination, requiring immediate medical attention.