The following are some of the reasons: 1, intestinal inflammation, especially dysentery, acute enteritis, are prone to black green stools, and very smelly stools, unshaped stools, abdominal pain, increased number of stools. 2, indigestion, is a common symptom, ate undigested food, poor gastrointestinal function are prone to indigestion, indigestion is prone to black green stools, and diarrhea, bloating. 3, drug factors, some drugs can also lead to stool color change, such as taking antibacterial drugs, will appear black green stools, no need to treat, stop taking drugs after the color will return to normal. 3, drug factors, some drugs can also lead to stool color change, such as taking antibacterial drugs, there will be a black green stool, no need to treat, stop taking drugs stool color will return to normal. 4, dietary factors, eat too much green fruit, green leafy vegetables or kelp, a large number of chlorophyll will enter the gastrointestinal, easily lead to stool become black green, the gastrointestinal chlorophyll is metabolized in the end The color of the stool will return to normal.