Blood in the sputum in the morning is most commonly caused by infectious diseases of the respiratory system, such as acute tracheobronchitis and lung infections, and can be seen in the sputum in the morning, caused by the destruction of capillaries due to violent coughing. It can also be seen in pulmonary tuberculosis, which is associated with cough and blood in the sputum, as well as wasting, weakness, and low fever in the afternoon. It can also be seen in malignant tumors of the lung, which, in addition to blood in the sputum, can be accompanied by lethargy, weakness, and afternoon fever, and is usually seen in people over 40 years of age who smoke. In addition to these respiratory diseases, it can also be seen in localized lesions, such as gingivitis, which happens to be accompanied by coughing, and can be seen with blood in the cough and sputum, with the blood coming from the gum margin. It can also be seen in bleeding from the nasal cavity, let’s say sinusitis, which may result in bloody nasal discharge. When bloody nasal mucus flows backwards into the mouth and pharynx, it can be coughed out via coughing, and blood in the cough and sputum may appear. Laryngitis can also damage local capillaries and cause local bleeding when coughing violently, which also manifests itself as coughing and blood in sputum.