If the lips always foam at the mouth, you need to discuss the problem from both Chinese medicine and Western medicine. From the perspective of Chinese medicine, this is a manifestation of deficiency. Usually due to kidney deficiency, Yin deficiency, lung deficiency caused by always foamy lips, white foamy mouth, white tongue coating, fluid reduction of the situation are caused by the above reasons. From the point of view of western medicine, it is usually the following diseases: 1, the most common disease is endocrine metabolic diseases, such as diabetes, there will be white tongue coating, and the situation of white foam on the lips. 2, for example, hyperthyroidism or hyperadrenocorticism, at this time, there will also be the situation of white foam on the lips often. 3, in the case of perioral infections, herpes on the lips, accompanied by pus secretion, there will also be the situation of white foam on the lips. 4, when the lips are infected with herpes, accompanied by pus secretion, there will also be the situation of white foaming on the lips. When secretions are secreted, frequent foaming of the lips may also occur.4. In respiratory infections, frequent foaming of the lips may also occur.