Cerebral ischemic foci may have no clinical symptoms, or they may show symptoms of chronic ischemia in the brain, such as headache, dizziness, memory loss, and unsteady walking. Cerebral ischemic foci are imaging manifestations due to chronic hypoxia in the brain, which are usually detected by cranial CT or MRI, and can be clinically asymptomatic or present with symptoms of chronic ischemia in the brain, which are related to the site of cerebral ischemia and its size. For example, subcortical ischemic lesions may appear as headache, dizziness, memory loss, etc.; ischemic foci in the basal ganglia area and the centrocentral area of the semiovals may appear as dizziness and unsteady walking. The main cause of ischemic foci is atherosclerosis. The occurrence of atherosclerosis is usually associated with numerous risk factors, such as smoking, hypertension, hyperlipidemia, diabetes mellitus, obesity, mental stress, sleep and so on. Relevant risk factors should be controlled in general to avoid the occurrence and progression of atherosclerosis, thus preventing further progression of ischemic foci in the brain. When cerebral ischemic foci are detected, timely counseling and intervention treatment are recommended.