The initial characteristics of cerebral embolism generally include a sudden onset and rapid progression of the condition. It often occurs during physical activity, with the condition reaching a peak in a very short time. Typically, within a short period, this can lead to complete paralysis of limbs on one side, complete loss of speech in some cases, and severe cases may quickly progress into a coma. The development of the condition is quite rapid.

Common sources of emboli in cerebral embolism include mural thrombi from the heart and detached plaques from the carotid artery. Carotid artery plaques, especially soft plaques, are prone to detachment, forming emboli that block the cerebral vessels and cause cerebral embolism. Additionally, patients with arrhythmias or atrial fibrillation can easily form mural thrombi on the inner walls of the heart. Once a thrombus detaches, it can block cerebral vessels, leading to cerebral embolism. The affected area in cerebral embolism is relatively large, and the condition is quite severe.