According to traditional Chinese medicine, a pale and tasteless mouth and poor diet are mostly due to weakness of the spleen and stomach after illness and loss of health in transportation and transformation. It is often accompanied by loss of appetite, weakness of the limbs, fullness of the chest, and a pale tongue with white fur. Paleness of the mouth, which refers to a delayed taste in the mouth and the inability to taste food and drink due to the self-consciousness of paleness in the mouth, is mostly seen in the initial or receding stages of inflammation, while enteritis, dysentery and other digestive system diseases are more common, and also seen in the recovery stage after major surgery. Endocrine diseases and chronic febrile wasting diseases, malnutrition, vitamin and trace element zinc deficiency, protein and caloric intake of patients, also often have a sense of light mouth, because such diseases can make the tongue taste buds sensitive to reduce and cause the mouth light and tasteless. In addition, a bland and tasteless mouth and a weakened or even absent sense of taste is also one of the characteristics of cancer patients.