Left frontal lobe softening foci are usually old lesions that are not serious, but if there is a new lesion of cerebrovascular disease in the left frontal lobe, it is serious and can lead to limb dysfunction and so on. Left frontal lobe softening foci is a kind of old lesion, which indicates that the patient has previous history of cerebrovascular disease, the brain tissue ischemia and hypoxia necrosis and left old lesions, including cerebral infarction, cerebral hemorrhage and so on. If the patient has a past history of cerebrovascular disease, active prevention should be carried out to address the risk factors of cerebrovascular disease. If cerebrovascular disease recurs, it may lead to limb dysfunction and may be life-threatening in severe cases. Patients with cerebral infarction should use antiplatelet aggregation drugs, statins, etc. as prescribed by the doctor, and at the same time strictly control diabetes mellitus and hypertension. If cerebral hemorrhage is the cause, it is recommended to actively treat the underlying disease. If the left frontal lobe softening foci are found, it is recommended to seek medical treatment as soon as possible, and standardized diagnosis and treatment under the guidance of professional physicians.