When there is numbness on the outside of the left foot, you can hang up neurology, orthopedics or endocrinology. There are many causes of numbness on the outside of the left foot, and we need to choose the appropriate department to consult according to different causes. If the numbness on the outside of the left foot is caused by central nervous system diseases such as cerebral infarction, cerebral hemorrhage, etc., you can go to the Department of Neurology. If the patient has serious lumbar spondylosis, which may be caused by compression of the sciatic nerve, he can go to the orthopedic department. If a diabetic patient has numbness on the outside of the left foot, and usually has poor blood glucose control, he may have diabetic peripheral neuropathy, and can go to the endocrinology department. When the left foot lateral numbness symptoms, you can first go to the neurology department, complete the cranial nuclear magnetic and other related examinations to rule out cranial lesions, and then according to the condition of the need to orthopedics or endocrinology consultation.