Blood in the sputum in the morning may be caused by pharyngitis, rhinitis, pneumonia, tuberculosis and other reasons. 1. Pharyngitis: In the acute infection period of pharyngitis, it is easy to cause the blood vessels in the throat to become congested, which can easily cause the blood vessels to rupture and bleed when coughing, especially in the morning when the coughing is more serious, you may get up with blood in the sputum in the morning, which can be accompanied by dry and itchy pharynx and other symptoms. 2. Rhinitis: because of rhinitis, under the stimulation of inflammation, resulting in nasal mucosa congestion and edema, easily cause nasal mucosa rupture bleeding. And at night when you sleep, if the head position is low, the snot mixed with blood will flow to the throat, thus causing blood in the sputum in the morning. 3. Pneumonia: usually caused by bacterial, viral and other pathogenic bacteria infection, can lead to the patient’s airway mucosa congestion, edema, inflammation once the involvement of submucosal blood vessels, easy to cause blood vessel rupture and bleeding, which may result in the sputum with blood in the morning. 4. Tuberculosis: the disease is usually caused by Mycobacterium tuberculosis infection, stimulated by inflammation, can lead to increased permeability of the bronchial pulmonary capillaries, which may cause blood vessel damage bleeding, resulting in blood in the sputum in the morning. Blood in the sputum in the morning may also be related to other factors, it is recommended to seek medical attention as soon as possible.