Blood in the sputum of a cold is mainly considered to be related to the local lesions of the cold itself, but attention should also be paid to exclude any special conditions. Cold is a very common clinical disease, which can cause inflammatory lesions in the respiratory tract and local mucous membrane congestion and edema. If there is a cough and sputum, it can lead to the rupture of local capillaries, resulting in blood or fresh blood in the sputum. Don’t worry too much about this situation, if the bleeding is not too much, it can be effectively relieved after active treatment of cold. If the symptoms are not relieved, or the bleeding volume is relatively large, you should rule out any special diseases, such as long-term smokers, to rule out any tumor-related diseases through chest CT examination. For patients who do not yet have systemic symptoms, such as low fever in the afternoon and night sweats, it is important to rule out the possibility of tuberculosis. The presence of bronchiectasis should also be considered, and further treatment should be done according to the test results.