Cold and cough with blood in sputum is often considered capillary rupture and lead to bleeding, but also consider the combination of other hemoptysis of the lung disease, such as bronchiectasis, tuberculosis, etc.. 1. Patients with colds often lead to viral infections in the throat, which in turn produce sputum, and patients often cough violently as a result, which may lead to capillary rupture and blood in the sputum. 2. Bronchiectasis, due to the continued destruction of the bronchial structure after bronchiectasis, capillary dilatation and congestion, once the inflammatory stimulus will occur hemoptysis. 3. In tuberculosis, Mycobacterium tuberculosis will invade the lung tissue, and then lead to the destruction of the bronchial mucosa, causing hemoptysis. If the patient has blood in sputum, it is recommended to consult a doctor in time to clarify the cause of the disease and standardize the treatment.