Morning saliva yellow and cloudy occasionally a little blood may be physiological factors, may also be the manifestation of certain diseases, such as oral inflammation, nasal diseases, digestive diseases, etc., should be timely consultation to find out the cause of the disease. 1. Physiological factors: dry climate, colds and nasal congestion, sleep for a long time with mouth breathing may lead to dry oral mucosa, wake up in the morning after friction may lead to capillary rupture bleeding, oral bacterial decomposition may appear in the morning with blood in the saliva turbid performance. 2. Pathologic factors: (1) Oral inflammation: such as periodontitis, gingivitis, etc., may be due to the accumulation of dental calculus between the teeth and gums to stimulate inflammation of the tissues around the gums, may bleed under the stimulation of sucking or brushing, or bleeding at night. In the morning, the saliva is mixed with plaque or food debris, making the patient’s saliva cloudy with blood. (2) Nasal diseases: such as sinusitis, dry rhinitis, nasal tumors, etc. can lead to intranasal bleeding, and the blood may flow back to the mouth when resting, so that the saliva spit out in the morning is cloudy with blood. (3) Gastrointestinal diseases: bleeding from upper gastrointestinal diseases, or gastroesophageal reflux and other diseases lead to upward reflux of esophageal contents at night during rest, and part of blood and gastric and esophageal contents are mixed in saliva, which makes the saliva spit out in the morning turbid with blood. If physiological factors are ruled out, you should consult a doctor in time to clarify the specific cause and, if necessary, carry out appropriate treatment.