There are many causes of bitter tongue root in patients, including biliary tract diseases, poor gastrointestinal digestive function, irregular life, lack of sleep, dietary factors, etc., which may be caused, and can be investigated according to the above aspects, as follows: 1. Bad living habits: including fatigue, lack of sleep, alcoholism, smoking, lack of sleep, staying up late, overeating, etc., which may lead to bitter tongue root. 2. Extra-hepatic diseases: digestive system If there is any abnormality in the digestive system or respiratory system or cardiovascular system, it may also lead to bitter tongue, especially poor digestion, poor gastrointestinal function, poor gastrointestinal power, as well as serious respiratory system and cardiovascular system diseases, which may also lead to bitter mouth. 3, liver and gallbladder problems: especially cholecystitis and gallstones, cholecystitis and gallstones often easily cause abnormal bile excretion, which leads to bile reflux and This leads to abnormal occurrence of bitterness in the mouth. Therefore, the above aspects should be investigated.