The causes of brownish red saliva include leukemia, hemophilia, gingivitis or periodontitis, and reflux esophagitis. 1. Leukemia: if various factors lead to abnormal proliferation of leukemia cells, so that the normal hematopoietic function is inhibited, then it is easy to cause bleeding in the mouth, so the saliva is brownish red. 2. Hemophilia: because of genetic factors lead to thrombin generation disorder, then there can be oral bleeding can not be stopped, so the saliva is red. 3. Gingivitis or periodontitis: due to plaque and other substances triggered by inflammation of the gums and periodontium, it is easy to cause bleeding of the gums, so the saliva is red. 4. Reflux esophagitis: when the patient’s stomach acid flows back into the mouth, the oral mucosa suffers damage, so the blood seepage. Finally, please go to the hospital in time to check the phenomenon of maroon color of saliva in the morning.