Blood in sputum does not require excessive concern if there is no abnormality in clinical examination, even if it bleeds. Many patients with blood in sputum, which is not found to be a problem after clinical examination, may be related to the climate, for example, in winter time when the climate is dry and the heating in the house is burning well, which may lead to the rupture of capillaries and thus blood in sputum. In addition, some of the blood in sputum may also be related to dietary habits, for example, some people like to smoke, drink alcohol, eat chili peppers and other stimulating foods. Some people will have reflux pharyngitis, which causes congestion and edema of the mucous membrane of the pharynx, which, together with coughing, may lead to the rupture of capillaries and bleeding, and objective examination or physical examination will not reveal the problem. Therefore, do not be anxious or afraid when you encounter this situation, as long as you can treat it correctly, it does not matter even if there is bleeding.