Swelling of the feet after discharge from the hospital after gastrointestinal bleeding in the elderly may be caused by cardiac insufficiency, renal disease and so on. 1. Cardiac insufficiency: the heart’s systolic and diastolic abilities are significantly reduced, venous return is obstructed, lower limb edema, dyspnea, venous rage and other manifestations can occur. Left heart insufficiency can be manifested as lung bruising, inability to lie down, dyspnea, limb weakness; right heart insufficiency can be manifested as swelling of both lower limbs, abdominal distension, liver and spleen bruising and enlargement, and even pleural effusion and ascites. 2. Renal diseases: such as glomerulonephritis, membranous nephropathy, uremia, acute renal failure, chronic renal failure, etc., due to the decline of renal filtration and other functions, which can cause the accumulation of urea nitrogen, creatinine and other toxins and affect the glomerular filtration and reabsorption function, the appearance of facial and limb edema, proteinuria, hypertension, hematuria and other symptoms. Elderly gastrointestinal bleeding after discharge from the hospital feet swelling may also be cirrhosis and other liver diseases caused by, it is recommended to consult a doctor in order to clarify the diagnosis, under the guidance of the doctor for targeted treatment.