Plantar fasciitis, flat feet, osteoarthritis, gout and other causes are considered. 1. Plantar Fasciitis: Aseptic inflammation occurs when the plantar fascia is repeatedly pulled due to frequent strenuous exercise or excessive walking, resulting in pain in the foot socket. 2. Flat feet: due to low arches, standing for a long time will increase the load on the feet, resulting in pain in the foot socket, which will improve with rest. 3. Osteoarthritis: due to the joint hyperplasia, degeneration and narrowing of the joint space in the foot, there is localized pain in the foot and limitation of activities. X-ray can be taken to clarify. 4. Gout: mostly acute pain attacks, accompanied by redness and swelling, and elevated uric acid in laboratory tests. If the pain in the foot socket is not alleviated by resting, it is recommended to go to the hospital for examination to clarify the cause for further treatment.