What does phlegm turbidity mean? The so-called phlegm turbidity is water that the normal body is not able to utilize and flows around the body, something dirty and muddy. Phlegm can run to the lungs, there will be a cough; run to the brain, there will be mental problems; run to the heart will appear high blood pressure. Overall phlegm is a pathological product that cannot be metabolized by the human body, and its retention in the body can cause a variety of diseases, including cough, cerebral infarction, thrombosis, including heart disease, myocardial infarction, and so on, all of which are closely related to phlegm.