Swelling below the calf six months after heart balloon surgery may have cardiac insufficiency, lower extremity venous thrombosis, can improve the cardiac ultrasound, lower extremity venous ultrasound and other definitive diagnosis, can be given diuretics to reduce the cardiac load, anticoagulation and other treatments. After cardiac balloon surgery, some people may have restenosis of blood vessels, which can lead to aggravation of cardiac ischemia, cardiac insufficiency, and lower limb edema. Cardiac ultrasound, BNP and other tests can be checked to clarify the diagnosis, and coronary angiography can be checked if necessary. Symptomatic patients can be given diuretic treatment to reduce the heart load, such as furosemide. After the heart balloon surgery, the lower extremity edema, there may also be the occurrence of lower extremity venous thrombosis, to carry out double lower extremity venous ultrasound examination, the existence of thrombus patients should be given anticoagulant therapy, commonly used drugs such as Rivaroxaban and other drugs. There are many other causes of lower extremity edema, such as oral antihypertensive drugs, lower extremity venous valve insufficiency, etc., the symptoms are obvious, we should go to the hospital in a timely manner, under the guidance of the physician to improve the relevant examination, to clarify the specific causes of the disease and targeted treatment.