Tastelessness of the mouth refers to a diminished sense of taste in the mouth, bland and tasteless, or the inability to taste food. Differential diagnosis of paleness and tastelessness: 1. Bitterness in the mouth Bitterness in the mouth refers to a bitter taste in the mouth. It is mostly seen in acute inflammation, mainly liver and biliary inflammation, which is often related to bile metabolism. Bitterness in the mouth can also be seen in cancer. Chinese medicine believes that bitter mouth is mostly heat, common in the stomach heat and heart fire on inflammation, especially in the liver and gallbladder fire, bile Qi rebellious disease. 2, mouth salty mouth salty refers to the self-conscious salty taste in the mouth. Most commonly seen in chronic nephritis, chronic pharyngitis and neurosis. In Chinese medicine, the mouth salty exhibition cold, kidney disease is more common. At the same time accompanied by back pain and weakness, fatigue and other symptoms. 3, mouth acidity mouth acidity refers to the patient’s consciousness of acidity in the mouth at times. Mostly due to excessive secretion of stomach acid, seen in gastritis, gastric and duodenal ulcers. Chinese medicine believes that acidity in the mouth is mostly due to liver and stomach disharmony or heat in the liver and stomach. 4, sweet mouth sweet mouth refers to the mouth consciously sweet taste. Sweet mouth is common in patients with diabetes and digestive system disorders. The reason why diabetic patients have sweet mouth is due to the increase of sugar in the blood and the increase of sugar in saliva. Digestive system dysfunction can cause abnormal secretion of various digestive enzymes, and sweetness can occur when the amylase content in saliva is increased. Chinese medicine believes that sweet mouth is mostly due to damp heat fumigation of the spleen and stomach and deficiency of qi and yin of the spleen and stomach. 5, mouth spicy mouth spicy, is the mouth consciously have a spicy feeling or tongue body numb spicy feeling. Spicy taste is a combination of salty taste, heat and pain sensation. Commonly seen in hypertension, neurosis, menopause syndrome and hypothermia, observation of the patient’s tongue can be seen in the tongue red and no tongue moss on the surface, because the surface of the tongue is not covered with tongue moss to protect, so the patient is sensitive to the salty taste and pain, temperature sensation, and feel spicy mouth. According to Chinese medicine, spicy mouth is mostly caused by heat in the lung and stomach and yin deficiency and fire. There are many clinical causes of abnormal sensory organ function, which can be caused by systemic diseases, local lesions, or even neurological lesions. Therefore, it is especially important to be cautious when abnormal sensory organ function occurs. Therefore, it is necessary to go to the hospital for examination when there is an unexplained abnormality in the function of the sensory organs.