A vertebrobasilar stroke occurs when blood flow to the back part of the brain is disrupted, often due to a blood clot or narrowed arteries. This area is responsible for vital functions such as balance, coordination, and vision. Symptoms may include dizziness, double vision, difficulty speaking, and loss of coordination. This type of stroke can be caused by various factors, including atherosclerosis, which is the buildup of fatty deposits in the arteries, or vertebral artery dissection, where a tear in the artery wall occurs. Prompt medical attention is crucial for effective treatment and recovery.