Cough with rusty odor may cause hemoptysis, there are many causes of hemoptysis, common in bronchial disease, lung disease, cardiovascular disease. 1. Bronchial diseases, common are bronchial dilatation, bronchopulmonary cancer and so on. Increased permeability of bronchial mucosa or capillaries or rupture of submucosal blood vessels cause hemoptysis. 2. Lung diseases, such as tuberculosis, Mycobacterium tuberculosis infection increases the permeability of lung capillaries and blood leaks out, resulting in sputum with blood or small blood clots. 3. Cardiovascular diseases, such as heart failure, pulmonary hypertension, hemoptysis caused by hemoptysis can be manifested as a small amount of hemoptysis or sputum with blood, coughing pink foamy sputum. As a result of pulmonary stasis caused by alveolar wall capillaritis rupture or bronchial varicose vein rupture of the bronchial submucosa. Cough rusty odor may also have other causes, should be taken seriously, timely medical care to identify the cause.