The patient’s left foot lateral pain may be dorsalis pedis fasciitis, wearing shoes improperly, metatarsal base tendonitis, as follows: the first case, dorsalis pedis fasciitis: generally consider the patient is dorsalis pedis fasciitis, mainly due to excessive walking, and caused by repeated strain on the dorsalis pedis fascia, there will be dorsalis pedis fasciitis strain, aseptic inflammation of the dorsalis pedis fascia, manifested as pain in the lamellar area of the dorsalis pedis, can be in the lateral side of the dorsalis pedis It can also be in the center of the dorsum of the foot. The second condition, wearing inappropriate shoes: it may be due to the patient wearing inappropriate shoes, such as tighter shoe upper, which produces extrusion and friction on the dorsum of the foot, which also causes inflammation of the soft tissue of the dorsum of the foot, and therefore also manifests as pain in the lateral aspect of the dorsum of the foot. The third condition, metatarsal base tendonitis: to consider the patient is the metatarsal base tendonitis, especially in the time of trauma or too much walking, may cause the peroneal short muscle to pull on the fifth metatarsal base, over time will cause tendon inflammation, manifested as the lateral pain of the foot.