Swollen feet and calves generally have the following causes: first, thrombosis, when there is a thrombosis in the veins of the lower limbs, there can be swelling of the calves and the necks of the feet, which is often caused by thrombosis of the veins in the popliteal fossa of the knee joint, resulting in swollen feet and calves, then early ultrasound and imaging of the lower limbs should be performed for early diagnosis and treatment with oral or intramuscular anticoagulant drugs; second, phlebitis and varicose veins of the lower limbs. and varicose veins of the lower limbs, phlebitis and varicose veins are common in patients who have been cold for a long time or who work on their feet for a long time, and this can also lead to swelling of the foot and neck as well as the lower legs, and then the relevant examination and venous ultrasound of the lower limbs should be performed for early diagnosis and treatment; third, heart and kidney diseases, when the heart and kidneys fail, there can also be symptoms of bilateral swelling of the lower limbs, which is due to This is due to poor venous reflux and hypoproteinemia, which should be diagnosed by a whole body checkup and examination.