Hepatitis B taking entecavir stomach pain, diarrhea, a large amount of gas in the abdominal cavity may be an adverse reaction of entecavir, or it may be caused by the combination of other diseases. After taking entecavir, there is a possibility of abdominal pain, diarrhea and other adverse reactions, because the reaction of each organism is different, so the probability of adverse reactions is also different, but clinically, after taking entecavir, it is rare to have a large amount of gas in the abdominal cavity. Therefore, it is necessary to consider the possibility of combining other diseases, such as the possibility of hepatitis B cirrhosis or hepatitis B hepatocellular carcinoma, and at the same time, if the combination of gastrointestinal perforation and abdominal infection, such symptoms may also occur. If this situation occurs clinically, you should go to gastroenterology or infectious diseases department, under the guidance of the doctor to improve the abdominal CT, liver function and other tests to further clarify the cause of the disease, do not blindly stop the drug.