The specific causes of plantar fasciitis are as follows: 1. plantar fasciitis: it is caused by long-distance walking or long-term mass exercise, which leads to pressure and chronic inflammatory lesions in the fascia of the sole of the foot, which can lead to pain in the middle of the plantar fascia and can be accompanied by limitation of foot movement. 2.Other: such as bone tumor or infectious disease, as well as tuberculosis, bacterial infection, can also lead to pain in the middle of the sole of the foot, you can check the foot CT, MRI to diagnose and early treatment. The pain in the middle of the sole of the foot should be diagnosed early and actively and treated according to the cause.