The causes of throat bleeding can include trauma to the throat from the outside of the body or from the inside. A hit or blow to the throat can cause bleeding inside the throat. Eating something that scratches the throat can also cause bleeding in the throat. Strep throat, sinusitis, the common cold, a heavy cough, influenza, laryngitis, tonsillitis, and throat cancer can also cause bleeding inside the throat. West Nile virus is also a cause for bleeding in the throat that is associated with coughing.

Reference:

symptomchecker.webmd.com

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Resource:

  1. What causes a throat bleed? – http://wiki.answers.com/Q/What_causes_throat_bleeds
  2. What Causes Throat Ulcers? – http://answers.ask.com/Health/Diseases/what_causes_throat_ulcers
  3. What Causes Sore Throat? – http://answers.ask.com/Health/Diseases/what_causes_sore_throat
  4. What Causes Mucus in the Throat? – http://answers.ask.com/Health/Diseases/what_causes_mucus_in_the_throat