Generally speaking, a bad stomach may result in yellowish tongue coating; however, the specific situation should be different from person to person and should not be generalized. Chinese medicine believes that the tongue moss endowed with stomach qi, tongue texture depends on qi and blood filling, the tongue discerns the taste and digestive function, the spleen is the main transportation (the spleen has the function of digesting food, absorbing the food essence and water and transferring it to the whole body), the stomach is the sea of water and grains, the spleen and stomach is the foundation of the day after tomorrow, and the source of qi and blood biochemistry, therefore, the formation of tongue image and changes react to the function of the state of the spleen and stomach. Yellow tongue coating is considered by Chinese medicine practitioners to be a manifestation of heat in the body; the more yellow the coating, the more severe the heat; yellow tongue coating will appear in gastric heat syndrome, and clinically manifested as burning pain in the stomach and epigastric region, thirst for cold drinks, elimination of gluten and good hunger (eating too much and still easy to be hungry), bad breath, constipation, and short, yellow urine, etc. If you feel unwell, please seek medical attention promptly. If you feel unwell, please consult a Chinese medicine practitioner for evidence-based guidance, and do not self-medicate to avoid delaying the optimal treatment of your condition.