Getting up in the morning and feeling bitter in the mouth is considered to be related to improper diet, oral gums, digestive tract problems may exist. If the previous day’s dinner ate too much big tonic and high-calorie, stimulating food, a large number of protein food decomposition can produce bad breath, bitter mouth phenomenon; or their own digestive tract problems, such as functional dyspepsia, reflux gastritis, food in the digestive tract residual fermentation will produce ammonia, ammonium salts, urea and other products with a special odor, resulting in bitter mouth in the morning. Oral diseases, such as gingivitis, periodontitis, dental caries, due to chronic inflammation in the oral cavity, as well as food residues in the caries, through bacterial fermentation can present bitter mouth, bad breath phenomenon. Therefore, if you exclude the food factor, you need to actively go to the hospital for further diagnosis and treatment to improve the symptoms.