Numbness of the left foot and left hand may be related to prolonged pressure, or it may be caused by cervical spine lesions, acute ischemic disease and other reasons. 1. Prolonged pressure: If the left side of the body is under pressure for a long time, resulting in poor blood circulation on the left side of the body, it may cause numbness in the left hand and foot. Usually it is not accompanied by other discomforts, and can be relieved quickly without special treatment. 2. Cervical spine lesions: especially the existence of cervical spine osteophytes or cervical disc herniation patients, easy to lead to local nerve root compression, resulting in nerve dysfunction of the innervated part of the compressed nerves, which may be manifested in the left foot and left hand numbness. 3. Acute cerebral ischemic disease: due to the patient’s local cerebral blood vessels have been narrowed or blocked, resulting in blood circulation in the lesion area is affected, which can easily lead to cerebral nerve damage, resulting in cerebral dysfunction, which may show numbness of the left foot and left hand, and can be accompanied by dizziness, headache and other symptoms. The numbness of the left foot and hand may also be related to other factors, if the symptoms continue to get no better, it should be taken seriously and seek medical attention as soon as possible.