Eat pineapple bleeding in the mouth mainly gum inflammation or blood system diseases caused by, it is recommended to seek medical periodontal treatment or hematology specialist treatment. 1. Gum inflammation calcium zinc oral solution: gums due to poor oral hygiene and chronic inflammation, gum tissue will appear red, swollen, bleeding or oral odor and other symptoms; so eating pineapple will compress the red, swollen and inflamed gums and bleeding symptoms, we must seek medical periodontal treatment to remove tartar or calculus caused by inflammation of the gums, in order to effectively prevent the emergence of the above symptoms. 2. Blood system diseases: leukemia, allergic purpura, etc. will lead to abnormal coagulation function of the body, so that the skin and mucous membranes are very susceptible to external stimuli and bleeding symptoms; so eating pineapple will lead to bleeding of the oral mucous membranes by the stimuli; you need to go to the hematology department for specialist treatment in order to effectively prevent bleeding in the mouth. Bleeding in the mouth after eating pineapple, if it happens repeatedly, it is recommended to consult a doctor in time for a clear diagnosis.