In Chinese medicine, bitterness in the mouth is mainly caused by actual fire in the liver and gallbladder or damp heat in the liver and gallbladder. The main methods of treating mouth bitterness include clearing the liver and gallbladder and diarrhea of fire. The main herbs for clearing the liver and gallbladder and diarrhea of fire are Scutellaria baicalensis, yellow gardenia, gentian herb, Yin Chen, rhubarb, and also chrysanthemum, honeysuckle, mulberry leaf, gypsum, poria and so on. Commonly used formulas are Gentian Diarrhea Liver Soup and Jade Lady Decoction. Commonly used Chinese medicines include Gentian Diarrhea Liver Pills and San Huang Tablets. If the bitterness in the mouth is due to damp-heat in the liver and gallbladder or actual fire in the liver and gallbladder, try not to drink alcohol, do not stay up late and eat less spicy food.