The possible reasons for the blood in the morning bowel movement and then no blood in the bowel movement are physiological factors such as eating a large amount of food containing dark pigment and pathological factors such as hemorrhoids, anal fissure, and so on. 1. Physiological factors: when people eat a lot of food containing dark pigment such as dragon fruit, watermelon, etc., these natural pigments can not be absorbed by the gastrointestinal tract, so it will be discharged red stools, mistaken for blood in the stool, so there will be a blood in the morning bowel movement and then no blood in the bowel movement. 2. Pathological factors: when the patient suffers from hemorrhoids, anal fissure, etc., when its condition is not serious, the patient’s blood is not common, when the patient eats a lot of spicy and irritating food, resulting in hemorrhoids, anal fissure, etc. aggravate the situation caused by bleeding, so there will be a blood in the morning and then there will be a blood in the morning and then there will be no blood in the bowel movement. When the blood in the morning bowel movement and then no blood in the bowel movement is also seen in other diseases, in the exclusion of physiological factors, should go to the hospital in a timely manner under the guidance of a professional doctor, so as not to delay the condition.