Blood in the throat may be caused by excessive use of voice, acute pharyngolaryngitis, acute tonsillitis, bronchitis or pneumonia. 1. Laryngeal cancer: During the growth of cancerous tissues, with the expansion of blood vessels and necrosis of tissues, bleeding in the throat with blood in sputum or coughing up blood may also occur. 2. Acute necrotizing inflammation: this disease can be divided into symptomatic and primary two categories, and the necrosis often involves mucous membrane and submucous membrane layer, and can reach the muscle layer. The necrotic tissue is dark black or brown, covered with pseudomembrane, easy to bleed, there will be blood in the throat. 3. Bronchitis: bronchitis is mostly dry cough in the early stage, later cough worsening, increased sputum, when coughing violently may cause laryngeal congestion, capillary rupture, thus appearing blood in the throat. 4. Pneumonia: Pneumonia is usually caused by upper respiratory tract infections, usually fever, cough, chest pain, dyspnea and other symptoms, and some patients will have bleeding throat. If you have blood in your throat, you should go to the hospital in time to see a doctor and get a clear explanation of the cause and then give targeted treatment.