Dear Johntrik, the presence of blood (even minute amounts) is not normal. It need not be of great concern, however, you should not delay to see your doctor. It may be caused by one or other problem of the respiratory system, especially the lungs. The blood is then "coughed" up while one is asleep and ends up in the mouth. You are advised to make an appointment with your doctor so that the exact cause of the blood in your saliva can be determined and appropriate treatment given. (MCH).
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