Pneumonia does not usually cause edema of the hands and feet. Pneumonia refers to inflammation of the lung tissue, including infectious and non-infectious inflammation, mostly infectious inflammation, and bacterial pneumonia is the most common. Edema, on the other hand, is one of the common clinical symptoms, which refers to the state of excessive fluid in the interstitial space of tissues. Edema of the lower extremities is the most common and can be caused by a variety of reasons, including decreased colloid osmotic pressure in blood vessels, increased capillary hydrostatic pressure, and obstructed lymphatic return. The most common causes of edema in the hands and feet are decreased colloid osmotic pressure and obstruction of lymphatic return, such as hypoproteinemia in patients with cirrhosis, which can cause edema in the hands and feet, and obstruction of lymphatic return due to malignancy, which can also cause edema in the hands and feet. In contrast, clinical symptoms caused by pneumonia, mainly fever, cough, sputum, chest tightness, chest pain, etc., do not cause hypoproteinemia and do not lead to lymphatic flow obstruction, so in most cases they do not cause edema of the hands and feet. However, in a small number of cases of severe pneumonia, the excessive consumption of the body can cause loss of albumin in the body, resulting in hypoproteinemia and thus edema of the hands and feet.