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  1. Coughing Up Blood: Causes and When To Seek Care - Cleveland Clinic

  2. Causes of Blood in Mucus, and How to Know If It’s an Emergency

  3. Spitting Blood - Symptoms, Causes, Treatments - Healthgrades

  4. Blood in phlegm: Causes, diagnosis, and when to see a doctor

  5. Hemoptysis (Coughing Up Blood): Causes, Diagnosis, and Treatment - WebMD

  6. Blood in Spit or Saliva: Causes, Risk Factors and Treatment

  7. When Coughing Up Blood and Blood in Mucus Is an Emergency

  8. Coughing up blood Causes - Mayo Clinic

  9. Saliva Blood: Causes and Treatment - Healthline

  10. Coughing Up Blood (Hemoptysis): Causes and Treatments - Health