Blood in sputum is not serious if it is caused by severe coughing or bleeding in the throat, but it is more serious if it is caused by lung cancer or tuberculosis. Whether blood in sputum is serious or not needs to be differentiated according to the causes. If it is caused by severe coughing and bleeding in the throat, the lesion is mainly in the throat, and the degree is usually relatively mild, and most of the lesions can be cured by themselves under the condition of paying attention to drinking plenty of fluids and taking rest. However, if the blood in sputum is caused by lung cancer or tuberculosis, the situation is relatively serious. On the one hand, the malignancy of the disease itself is relatively high, and on the other hand, standardized and systematic treatment is needed. Therefore, if you have blood in sputum, you need to consult a doctor in time, and under the doctor’s guidance, conduct relevant laboratory tests to help clarify the cause of the disease and assess the condition, and then follow the doctor’s instructions to carry out standardized treatment.