The red color in the toilet after eating dragon fruit may be a normal physiological phenomenon or a pathological phenomenon. 1. Normal physiological phenomenon: Under normal circumstances, after eating red dragon fruit, the red color of dragon fruit mixed in the stool. Within 1 to 3 days after eating red dragon fruit, the stool may be red in color when you go to the toilet. But after stop eating dragon fruit, the stool can return to normal color, the specific time of red stool and their own bowel regularity. 2. Pathological phenomenon: If the stool is red after eating red dragon fruit, it is considered that there may be gastrointestinal bleeding. So from eating dragon fruit alone to the toilet red stool, can not judge whether it is normal, but also need to further check the stool routine, colonoscopy and other items to determine the cause.