Patients with bronchitis can cough up blood due to coughing and infection that can lead to congestion in the throat and airways. Coughing up blood due to bronchitis is usually characterized by very small amounts of blood or only blood in the sputum, and does not require the combined use of hemostatic drugs. The patient’s clinical symptoms can be relieved with effective anti-infective treatment, and basically no major coughing up of blood will occur. However, it is also important to be alert to coughing up blood caused by other respiratory diseases, so further improvement of lung imaging is necessary. The main respiratory diseases that cause coughing up blood include bronchiectasis, pneumonia, tuberculosis, lung cancer, pulmonary embolism, etc. After excluding the above diseases, coughing up blood caused by bronchiectasis will not be too obvious, and there is no need to worry too much.