There are several common causes of pain on the lateral side of the left foot: first, acute trauma, including acute contusions, acute crush injuries and impact injuries, may cause local pain. Second, due to the imbalance of the foot plantar weight-bearing, and the increased weight-bearing of the lateral dorsum of the foot, which will cause cumulative damage after a long time, resulting in local pain, such as the common imbalance of wearing shoes inside and outside, foot inversion deformity may lead to the imbalance of the weight-bearing of the plantar. Third, lower limb or lumbar diseases, due to the presence of lumbar and lower limb diseases, compression of the sciatic nerve, resulting in pain in the dorsal sciatic nerve innervation area of the foot. Fourth, local bone tumors or soft tissue masses may produce compression pain due to the growth of the masses.