Carotid Artery Dissection is a medical condition where a tear occurs in the inner lining of the carotid artery, which supplies blood to the brain and face. This tear can lead to blood accumulating between the layers of the artery wall, potentially narrowing or blocking blood flow. Symptoms may include sudden headache, neck pain, or neurological issues like vision changes or weakness. The condition can result from trauma, such as a sports injury or whiplash, but it can also occur spontaneously. Diagnosis typically involves imaging tests like MRI or CT scans, and treatment may include medications or surgery to restore normal blood flow.