Left hand numbness and left foot numbness generally have the following causes: first, cervical spine disease, cervical spondylosis when the protruding disc or hypertrophic ligaments compress the spinal cord, can appear numbness and weakness of the extremities, can also appear numbness of the left hand and left foot, which is often accompanied by unstable walking. Secondly, cervical spine tumor, when the spinal cord of cervical spine has tumor, the symptoms of left hand numbness and left foot numbness can also appear. Thirdly, tumor in the head with nerve compression can also cause numbness in the left hand and foot, which should be diagnosed by head MRI. Fourth, cerebral infarction or cerebral hemorrhage, when cerebral infarction or cerebral hemorrhage occurs in the basal ganglia, symptoms of limbs may appear, and hemiplegia such as left hand and left foot numbness may occur.