Cerebral ischemic foci is not a medical diagnosis, not a disease name, it is an imaging sign found by imaging tests such as cranial CT or MRI. The extreme majority are atherosclerosis, that is, secondary changes in the cerebral vasculature as a result of systemic atherosclerosis caused by long-term hypertension, hyperlipidemia, and diabetes mellitus. Acute stenosis of small deep blood vessels in the brain often triggers small cavernous infarcts, while chronic stenosis, with insufficient blood supply for a long time, results in ischemic foci. Thus ischemic foci are an imaging manifestation of chronic ischemia in the brain, rather than a thrombus. When ischemic foci appear, it is recommended to consult a doctor in time for early intervention and treatment under the guidance of a professional doctor to avoid further progression of ischemic foci.