The presence of blood in the first sputum of the morning requires consideration of different degrees of inflammatory reactions in the airways, most commonly bacterial infections in the airways that damage the airway mucosa and rupture and bleed capillaries, such as acute upper respiratory tract infections, pharyngitis, bronchitis, pneumonia, etc. Also seen in coagulation disorders, such as leukemia, aplastic anemia, thrombocytopenic purpura, etc., when poor coagulation is prone to rupture of the oral mucosa and bleeding more than once. It is also seen in chronic diseases such as laryngeal cancer, nasopharyngeal cancer, lung cancer, etc. This symptom can also occur. You can check the blood routine, examine the bone marrow if necessary, take CT of both lungs, and do bronchial fiber endoscopy if necessary to clarify the cause.