Cerebral embolism generally has a rapid onset and develops quickly, often occurring during physical activity. Within a short period of time, the condition can peak, and patients may experience sudden coma or complete paralysis of one side of the body, as well as aphasia, dementia, and cognitive dysfunction. Overall, the progression of the disease is very fast and can reach a peak in a short time. These patients often have underlying diseases, such as atrial fibrillation, which is a type of arrhythmia. In patients with atrial fibrillation, mural thrombi can form on the inner walls of the heart. These thrombi can detach and, carried by the bloodstream, block cerebral vessels, leading to cerebral embolism. Additionally, some patients have a foundation of arteriosclerosis, particularly in the carotid arteries, which can form plaques, especially soft plaques. When these plaques detach, they can form emboli that block cerebral vessels, causing cerebral embolism.