The symptoms of numbness on the lateral side of the foot are commonly caused by the following: first, acute injury, acute injury to the lateral side of the foot can lead to bleeding and hematoma formation, which can compress the local sensory nerves and lead to numbness on the lateral side of the foot. Trauma to the ankle and knee joints will also produce plantar lateral numbness due to compression of the nerve stem. Secondly, it can be seen in chronic strain injury, due to chronic strain injury of the plantar area leading to the production of sterile inflammation, inflammatory stimulation will also lead to the symptoms of local sensory numbness. Third, it can be seen in the lower limb sciatic nerve trunk is affected or the nerve root is compressed, which can lead to abnormal sensation in the foot. Certain systemic diseases can also lead to numbness of the lateral plantar aspect of the foot, for example, diabetes can lead to neuritis of the lateral plantar nerve, which will affect the sensory conduction and numbness symptoms.