Normal carotid and vertebral arteries can also get cerebral infarction. The thrombus of cerebral infarction not only originates from carotid and vertebral arteries, but also originates from the heart, such as rheumatic heart disease, atrial fibrillation, and thrombus attached to the wall of myocardial infarction, etc. Vasculitis can also cause in-situ thrombus formation, leading to cerebral infarction. The most common source of thrombus for cerebral infarction is the carotid artery and vertebral artery. When atherosclerosis occurs in the carotid artery and vertebral artery, if the plaque is dislodged, it can embolize the blood vessels in the brain and lead to cerebral infarction. However, there are also emboli from sources other than the carotid and vertebral arteries, such as the heart valves of patients with rheumatic heart disease can develop redundancy, which can lead to cerebral infarction if the redundancy is dislodged. In atrial fibrillation, blood can form a thrombus in the atria due to the formation of eddy currents in the atria, and the dislodgment of the thrombus can lead to cerebral infarction. In myocardial infarction, an attached thrombus can form within the ventricle, and dislodgment of the thrombus can also cause cerebral infarction. If vasculitis occurs in the blood vessels of the brain, it can directly lead to the formation of blood clots in the blood vessels of the brain, which in turn can lead to cerebral infarction. Therefore, once the symptoms of cerebral infarction appear, it is necessary to follow the doctor’s instructions for treatment in a timely manner.