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

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

  3. When Should You Be Concerned About Bloody Mucus? - GoodRx

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

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

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

  7. Coughing up blood Causes - Mayo Clinic

  8. Hemoptysis - Wikipedia

  9. Why Am I Coughing Up Bloody Mucus? - MedicineNet

  10. Hemoptysis: What Is It, Causes, Diagnosis | Osmosis