A low-density foci in the brain seen under CT of the head is a blockage of small blood vessels in the brain, which means that the patient has a mild cerebral infarction. Patients should not be too alarmed when they see low density foci in the brain under CT, but mainly intervene from the usual lifestyle. We should control the underlying diseases of cerebrovascular disease, such as hypertension, hyperlipidemia and hyperglycemia, and we must quit smoking and limit alcohol in general, and eat a light, low-salt, low-fat diet and increase physical exercise appropriately. You can start the primary prevention medication for cerebrovascular disease, you can take oral aspirin for a long time to prevent the occurrence of cerebral infarction. It is recommended that patients should have their blood lipids checked and also have an ultrasound examination of the neck vessels. If the blood lipids are also high and there is also plaque in the neck blood vessels, it is recommended to take oral statin lipid-lowering drugs to stabilize the plaque and prevent the occurrence of cerebral infarction.