Left foot pain when walking may be due to the following reasons: First, plantar fasciitis, plantar fasciitis is often due to long-term long-distance walking, or due to long-term sports, such as basketball, soccer, resulting in chronic aseptic inflammation of the plantar fascia, and the appearance of pain in the palm of the foot, which should be related to the examination of the exclusion of other diseases for diagnosis. Secondly, plantar fat pad inflammation, there are fat pads on the soles of the feet, when it has chronic aseptic inflammation, it can also appear when walking under pressure and have pain in the palms of the feet. Third, metatarsal head inflammation, if the metatarsal head pain is caused by long-term walking or due to chronic inflammation, X-ray examination should be carried out to exclude fatigue fracture for further treatment.