The causes of sudden swelling of the foot and walking pain are trauma, gout, lower extremity thrombosis and so on. 1. Trauma: due to impact, broken foot, fall and other traumatic factors, may cause the patient foot ligaments, muscle fibers, etc. rupture, the formation of hematoma, thereby stimulating the nerve, triggering the patient to appear foot pain, foot swelling and other symptoms. 2. Gout: If the patient suffers from gout, when consuming too much high-purine food, irregular diet, irregular rest, etc., it will trigger the recurrence of gout, resulting in edema of the patient’s feet, pain when walking symptoms. 3. Lower extremity thrombosis: If the patient’s lower extremity veins form a thrombus, it will cause blood circulation in the lower extremities to be impaired, venous blood reflux is blocked, thus triggering the patient’s lower extremities to appear edema, swelling and pain, etc. The patient’s feet suddenly swell and it hurts to walk. There are many reasons why the feet suddenly swollen walking pain, it is recommended that patients go to the hospital in a timely manner to improve the relevant examination, to clarify the cause of the disease, and comply with the doctor’s instructions for treatment.