The possible causes for blood in saliva

The possible causes for blood in saliva are :
-Rough brushing, this can be due to hard brissels of brush, hurry while brushing etc.

-Tongue bite, some people may bite their tongue during sleeping and that can come out as bleeding in saliva in the morning.
-Injuries while cleaning the tongue, because of having long nails, hurry, using sharp tongue cleaners etc.
-Nasal bleeding, sometimes nasal bleeding can come through the mouth.
- General coagulation disorders, these can present as bleeding from gums etc.
- Vicarious bleeding, during the time of menstrual periods, some women may present with bleeding from other sites of the body.
-Injuries due to dentures, fall etc can present with bleeding from mouth.
- Bleeding from internal causes like oesophageal varices can present with bleeding.

-Carcinomas of the structures in the mouth or upper gastrointestinal track can present with bleeding in saliva.