Swelling of the arch of the foot and pain when walking may be caused by osteoarthritis, stress fracture, gout and other factors. 1. Osteoarthritis: If you walk or carry too much weight, it may cause serious wear and tear between the joints of your feet and osteoarthritis, which may cause swollen arches and pain when you walk. 2. Stress fracture: If the muscles in the feet area are strained for a long time, it may cause bone damage, resulting in stress fracture, which may cause swelling and pain in the arch of the foot, and the patient’s exercise in this case may aggravate the pain, and may even lead to activity limitation. 3. Gout: Due to the high uric acid in the body of gout patients, it is easy to accumulate inside the joints such as toes and ankles, producing aseptic inflammation, and the stimulation of inflammation may lead to the symptoms of swollen arches of the feet, which are painful as soon as you walk. In addition, onychomycosis and flat feet may also lead to swollen arches and pain when walking. It is recommended that patients consult a doctor in time to clarify the cause of the disease and then treat it actively so as not to delay the condition.