It is normal to cough up some mucus when combating an infection. This is sputum that forms in the lower airways. Blood-tinged sputum usually occurs when there is inflammation of the larynx, trachea, or bronchi. The lower airways may also have small tears or injuries that bleed into the sputum.

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.