It is not normal for the spit to be brown at night, it may be due to periodontitis, throat diseases, blood diseases and other reasons.
1. Periodontitis: such as plaque, calculus and other causes of stimulation caused by gingivitis or periodontitis, may cause the gums of congestion and edema, capillary rupture lead to night spit saliva is brown.
2. Pharyngeal diseases: acute and chronic pharyngitis and tonsillitis and other diseases can cause local capillary expansion and rupture, which may also lead to spit at night is brown.
3. blood disease: leukemia, hemophilia, thrombocytopenia, etc. will cause blood clotting function abnormalities, may also lead to the night spit out saliva is brown.
There may be other reasons for the brownish color of the spit at night, and you need to go to the hospital in time to check the cause of the problem.