Coughing with a bloody smell considers the possibility of respiratory bleeding as follows: 1. Bleeding in the throat or bronchial bleeding, which is coughed out through coughing action and can be manifested as blood in the sputum or hemoptysis, such as acute upper respiratory tract infections, including pharyngitis and acute tonsillitis, can lead to rupture of the mucous membrane in the throat and cause coughing up blood, which can result in a bloody smell when coughing. 2. Diseases of the lungs, such as bronchial dilatation or bronchial tuberculosis or pulmonary tuberculosis, can cause a bloody cough. This is because all these diseases can cause the bronchial mucosa to rupture, thus causing bleeding. 3. Tumors in the lungs can also cause blood in the sputum or coughing up blood, thus causing a bloody cough. Therefore, if you have a cough with a bloody odor, you should promptly improve your laryngoscopy or CT lung examination to clarify.