The common clinical causes of stiff and painful feet include fasciitis, rheumatoid arthritis, gout and so on. 1. Fasciitis: prolonged engagement in heavy physical labor or prolonged walking may lead to obstruction of blood circulation and sterile inflammation, which may lead to stiffness and pain in the ball of the foot. 2. Rheumatoid arthritis: Inflammatory cells may invade the joints of the feet, causing irritation to the surrounding nerves and leading to stiffness and pain in the feet. Rheumatoid arthritis is an autoimmune disease. 3. Gout: usually like to eat high purine food, may lead to purine metabolism disorder. Urate crystals are deposited in the joint cavity of the foot, which can cause local irritation and may lead to stiffness and pain in the foot. Stiff and painful feet may also be related to other causes. It is recommended to visit the hospital as soon as possible to clarify the cause.