Patients with numbness in the left foot are related to local nerve compression and cerebrovascular disease, as follows: 1. Local nerve compression: patients may have lumbar spine lesions that compress local nerves and cause numbness in the left foot, such as lumbar disc herniation, while patients may have low back pain, and some patients may have sciatica, and if necessary, check the lumbar spine MRI for a clear diagnosis. 2. Cerebrovascular disease: patients with cerebrovascular disease, such as a small amount of cerebral hemorrhage on the right side, small cerebral infarction, may also cause numbness in the left foot, and at the same time there may also be motor dysfunction of the left limb. General acute onset, middle-aged and elderly people, most patients may have a history of hyperlipidemia, diabetes, hypertension, brain CT or brain MRI can be a clear diagnosis, the onset of hospitalization in a timely manner, if necessary, the application of some nerve-nourishing drugs.