There are several possible causes of left pinky and left foot numbness: first, head diseases, when there is a tumor or infarction or bleeding in the head, which compresses the nerves in the basal ganglia area, the symptoms of left pinky and left foot numbness can appear, then early physical examination and CT and MRI of the head should be conducted for early diagnosis and treatment; second, neck diseases, when cervical spondylosis compresses the spinal cord, it can symptoms of numbness in the left little finger and left foot appear. In the case of cervical spinal cord tumor, the symptoms of numbness and weakness of half of the limbs can also appear. In this case, X-ray, CT and MRI of the cervical spine should be performed for early diagnosis and early treatment, and cervical spine surgery may be required if necessary.