Thick tongue coating is usually seen in phlegm-dampness, food accumulation (accumulation of food in the stomach due to indigestion), and internal heat, etc. Bitter mouth is usually seen in heart fire or liver and gallbladder fire-heat syndrome. Thick tongue coating with bitter mouth is usually seen in the liver and gallbladder damp-heat syndrome, which should be identified by a medical professional according to the specific situation. Damp-heat of the liver and gallbladder is often manifested by pain and distension, bitter mouth and dullness (lack of appetite, reduced food intake), nausea and vomiting, abdominal distension, short and yellow urine, yellow and greasy moss, and number of strings on the pulse. Mostly due to the external infection of dampness-heat evil, or over-eating fat, dampness-heat, internal growth of the liver and gallbladder due to the accumulation. Liver and gallbladder damp-heat patients can take gentian diarrhea liver soup under the guidance of the physician, which has the effect of clearing the liver and gallbladder fire, clearing the liver meridian damp-heat, commonly used in the treatment of headache, eye red, dystocia (coxa-rib pain), bitter taste in the mouth, deafness, swelling of the ears, or women’s yellowish smelling, etc, with a red tongue, yellow and greasy coating, etc.. It is not suitable for diarrhea without stagnation and pregnant women. The medication should be taken under the guidance of a medical professional, do not self-medicate to avoid adverse consequences. If you have symptoms of thick tongue coating and bitter mouth, please seek medical advice if necessary.