The following factors are common for bitter mouth in the morning: a. Inflammation of liver and gallbladder, bitter mouth in the morning, mainly due to bitter mouth performance caused by damp heat in the liver and gallbladder, or inflammation and infection in the liver and gallbladder, bile excretion malfunction, causing bitter symptoms in the mouth. Second, stomach heat and bitterness, due to a long diet of spicy and stimulating food, resulting in stomach heat, poor gastric power induced esophageal inflammatory infection or bile reflux to the stomach, and the appearance of bitterness in the mouth. Third, irregular life, insufficient rest, smoking and alcoholism can also cause heat accumulation in the stomach and intestines, causing bitterness in the mouth and bitterness caused by inflammation in the mouth, fourth, mental bitterness, due to excessive pressure in life, improper diet and irregularity, less activity has weakened gastrointestinal function, food stays in the gastrointestinal process resulting in bitterness in the mouth, fifth, chronic diseases, such as diabetes, chronic inflammatory infection of the mouth and long-term Smoking and alcoholism can cause bitterness in the mouth.