Pneumonia generally does not cause swelling of the feet. Pneumonia is mainly due to various infectious or physicochemical factors that damage our alveoli, causing inflammation in the lungs, which leads to pneumonia. The main symptoms of pneumonia include coughing, fever, difficulty breathing, chest tightness, and expectoration. Generally, swelling of the feet does not occur. The occurrence of foot swelling is mostly due to right heart failure or poor venous flow in the cavity, and the stagnation of blood flow in the lower limbs leads to this edema. If this occurs, it is important to consider whether it is due to heart failure in the elderly, or conditions such as kidney or liver diseases leading to hypoalbuminemia, and relevant tests should be conducted. This is not a complication caused by pneumonia itself, but rather a problem with some other organs of the patient.