Cold spit black sputum, may be a violent cough makes the respiratory blood vessels are damaged, but also may itself patients with certain diseases such as chronic bronchitis, bronchodilatation, tuberculosis, etc., and colds due to the invasion of the virus, the above diseases will be aggravated caused. 1. When colds appear violent cough, may lead to respiratory blood vessels are damaged, bleeding in the respiratory tract after coagulation, coughing with the sputum discharged, so it looks black. 2. Chronic bronchitis: the main symptoms are chronic cough, coughing up sputum, some patients may have wheezing, sputum is usually white mucus or plasma foamy. When the cold combined with infection, sputum into mucopurulent or yellow pus sputum, and cough aggravation, the amount of sputum followed by a significant increase in the amount of sputum, and occasionally with blood, so the sputum spit out is black. 3. Bronchial dilatation: mainly manifested as repeated coughing, coughing up sputum, mainly white mucus sputum. Symptoms are aggravated after a cold, and there may be blood in the sputum or hemoptysis, and the patient manifests as spitting black sputum. 4. Tuberculosis: Tuberculosis patients mainly have cough, cough sputum, chest pain and dyspnea and other symptoms. When the cold worsens, you will cough up black sputum and even hemoptysis of different degrees. If you have a cold and spit up black sputum, you should go to a regular hospital in time to clarify the cause of the illness and cooperate with the doctor to avoid delaying the condition.