If a patient has swollen feet without pain, the causes are as follows: 1. tendon sheath cysts on the back of the foot: easily lead to swollen feet but no pain. 2. poor blood circulation in the lower extremities: such as varicose veins in the lower extremities, phlebitis, venous valve closure insufficiency, venous thrombosis, can also lead to swollen feet without pain. 3. cardiopulmonary insufficiency, kidney disease: also easily lead to swollen feet without significant pain. After a patient has swollen feet without pain, he or she must consult a doctor to see what causes it, and treat the cause to promote the reduction and recovery of swollen feet. In case of swollen feet, it is important to avoid standing for a long time to avoid aggravating the swollen feet.