There are many differences between pulmonary edema and lung cancer, such as different nature, different symptoms and different causes. 1. Different nature: pulmonary edema belongs to chronic respiratory disease, but lung cancer belongs to occupational disease. 2. Different symptoms: clinical symptoms of pulmonary edema mainly include wheezing, coughing and sputum, especially wheezing and coughing symptoms will be aggravated after activities. Clinical symptoms of lung cancer mainly include irritating dry cough, hemoptysis and chest pain. 3. Different causes: most of the pulmonary edema is due to the gradual development of chronic bronchitis. Lung cancer needs to be considered to be related to genetic factors and external cancer-causing factors, and the tumor is formed due to long-term effects. There is a big difference between pulmonary edema and lung cancer. No matter which kind of disease it is, patients should go to the hospital in time and take standardized treatment according to the doctor’s prescription, and should not ignore the symptoms and take it lightly.