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, so check the lumbar spine MRI if necessary to clarify the diagnosis. 2, cerebrovascular disease: patients with cerebrovascular disease, such as a small amount of cerebral hemorrhage on the right side, a small area of cerebral infarction, may also cause numbness in the left foot, while the left limb may also appear motor dysfunction. Generally 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 the disease should be timely hospitalization, if necessary, the application of some nerve-nourishing drugs.