In case of bitter mouth, the common cause is bile reflux, which is a pathological state, caused by abnormal peristalsis of the gastrointestinal tract, causing bile to reflux into the stomach and esophagus. Usually, under normal conditions, human bile is discharged from the bile ducts or gallbladder, into the duodenum and into the small intestine, where it participates in fat emulsification so that the fat is broken down and digested by lipase secreted by the pancreas. And if there is a bitter mouth, it is recommended to adjust the diet structure to vegetables and fruits, such as bananas, honey, cabbage and spinach, to promote the peristalsis of the gastrointestinal tract, which also facilitates absorption. In addition, drugs that promote peristalsis of the gastrointestinal tract, such as morpholine, can be applied to avoid the reverse flow of bile. In addition, the blood circulation can be accelerated through exercise, which can also reduce the possibility of psychological stress, psychological depression, and the need to regulate the work and rest. Usually, the symptoms of bitter mouth can be eliminated after the above-mentioned conditioning.