As the saying goes, the nose smells and the tongue tastes the five flavors. If one day everything you eat tastes like wax, then life will lose its meaning. On the contrary, if the mouth often feel a bad taste, such as acidity, bitterness, sweetness, can not be careless, because this is often a signal of a disease. 1, sweet mouth Generally speaking, the spleen heat mouth sweet, so the sweet mouth is mostly due to the dysfunction of the spleen and stomach. Because the digestive system dysfunction can lead to abnormal secretion of various enzymes, saliva amylase content increases, stimulating the taste buds on the tongue and feel sweet. In addition, diabetic patients with elevated blood sugar, saliva sugar is also elevated, also often appear sweet mouth and tongue. 2, sour mouth According to traditional Chinese medicine, liver heat is sour in the mouth, mostly due to the heat of the liver and gall bladder erosion of the spleen, and many people may also have a thin yellow tongue coating, bloating after eating, nausea, and even chest tightness and rib pain, which indicates that you may suffer from gastritis or peptic ulcers and other diseases, it is best to do further stomach examination immediately. Most people with bitter mouth are caused by dampness and heat, mostly due to liver and gallbladder dampness and heat and stomach heat, usually due to bile reflux, so first of all, you should check the stomach and gallbladder to see if there are any problems; some people who like late night snacks or over-eating spicy food will also have bile reflux causing bitter mouth; the elderly are also prone to bitter mouth because of poor gastric power; cancer patients also often have bitter mouth symptoms; then there are some brain workers. Due to mental stress, coupled with the dysfunctional rhythm of life and diet, the gastrointestinal function is stagnant and the food eaten stays in the stomach and intestines for too long, which also easily causes bitter mouth. 4, spicy mouth spicy taste or tongue with a numb and spicy feeling is mostly caused by lung heat or stomach fire on inflammation, common in hypertension, neurosis, menopausal syndrome and long-term low fever, most also have a cough, coughing phlegm yellow thick, thin yellow tongue coating and other symptoms. 5, salty mouth salty mouth and kidney-related, mostly due to kidney yin deficiency, deficiency fire upward, some are also accompanied by waist and knee weakness, dizziness and tinnitus, five heartburn, cold, cold limbs, fatigue, frequent night urination and other symptoms, mostly seen in chronic nephritis, neurosis, chronic pharyngitis or oral ulcers and other diseases.