There may be several reasons for the pain in the sole of the foot when walking: first, plantar fasciitis, plantar fasciitis is a chronic aseptic inflammation of the plantar fascia, often caused by exertion or cold, when the symptoms of pain in the sole of the foot when walking can appear, to carry out relevant physical examination and examination to exclude other diseases for diagnosis; second, fat pad inflammation, when the fat pad of the sole of the foot is damaged, can also appear Third, metatarsal headitis, when the metatarsal head of the metatarsal bone has chronic inflammation, can also appear when walking plantar pain symptoms, to carry out foot X-ray examination for diagnosis and treatment; fourth, tumor, when the metatarsal bone tumor, can also appear when walking plantar pain, then to carry out foot X-ray, nuclear magnetic examination Fifth, fatigue fracture, due to walking a lot of distance can lead to fatigue damage to the metatarsal bones of the foot, and fracture, then the foot X-ray, CT examination should be carried out for diagnosis and treatment.