Blood sputum in the throat when brushing teeth may be due to acute pharyngitis, lung tumor, tuberculosis and other diseases. 1. Acute pharyngolaryngitis: when the patient has acute pharyngolaryngitis, the inflammation will stimulate the throat area, resulting in capillary expansion, and after the patient has dry retching and coughing when brushing teeth, it will lead to the rupture of the expanded capillaries, which will lead to the bloody sputum situation. 2. Lung tumor: if there is a lung tumor, the tumor will gradually invade the blood vessels as it grows, leading to the expansion of bronchial blood vessels, which will result in coughing bloody sputum in the throat when brushing teeth. 3. Tuberculosis: Tuberculosis can also lead to the symptoms of bloody sputum, which is mainly caused by the internal tuberculosis bacillus invading the capillaries of the lungs and leading to bleeding. In addition to brushing teeth with bloody sputum in the throat may also be due to chest trauma, bronchitis disease, when this symptom occurs in a timely manner to consult a doctor to check, follow the doctor’s instructions for treatment.