There are several common causes of swollen feet with painful symptoms for no reason: First, acute gout attack, patients usually have a history of increased serum uric acid or a history of gout attacks, recent alcohol consumption or consumption of seafood induced acute gout attacks, clinical manifestations of acute redness, swelling, heat and pain in the foot, the pain is usually intense, resulting in the patient unable to leave bed activities, serum uric acid test, ultrasensitive C Serum uric acid test, ultrasensitive C-reactive protein test and erythrocyte sedimentation rate test all show high results, oral administration of gout and restriction of weight bearing on the affected limb can relieve the symptoms. Second, heart disease, such as right heart failure can lead to impaired circulation, lower limb venous blood flow obstruction, venous blood can be blocked in the foot causing swelling and pain, cardiac diuresis and elevation of the affected limb can reduce the symptoms of swelling and pain in the foot.