Green stool in middle-aged and old people may be caused by physiological and pathological factors, such as indigestion and gastrointestinal tract dysfunction. According to the cause, medication should be given, such as domperidone tablets and trimethoprim maleate tablets. 1. Physiological factors: If the elderly consume more green vegetables in daily life, the pigment can not be absorbed by the stomach and intestines, which will lead to abnormal stool color, appearing in the case of the elderly green stool, this is a normal phenomenon, without treatment. 2. Pathological factors: indigestion and gastrointestinal disorders can also cause green stools in the elderly. (1) indigestion: if the body of the middle-aged and elderly people are not fully digested and absorbed, gastrointestinal peristalsis increases, the food passes through the digestive tract too quickly, and the bile pigment can not be decomposed completely in time, which can lead to the situation of middle-aged and elderly people having green stools. You can follow the doctor’s instructions to use domperidone tablets for treatment, to promote the recovery of gastrointestinal power, improve indigestion, so as to alleviate the situation of middle-aged and elderly people with green stools. (2) Gastrointestinal dysfunction: If the intestinal flora of the elderly is imbalanced, it may cause the stool to be discharged too quickly, not absorbed by the intestine, and discharged with the color of bile, which is manifested as green stool in the middle-aged and elderly people. It can be treated with trimethoprim maleate tablets as prescribed by the doctor. If the middle-aged and elderly patients have green stool, it is recommended to consult a doctor in time to identify the cause of the disease and then targeted treatment. Drugs should be used under the guidance of a doctor.