Inside the lungs there are found to have fibrous nodules, which is mostly the previous inflammation did not clean up left behind, separated by a long time, fibrosis. There may also be long-term external stimuli, such as pollutants and toxic things or dust, so that the lungs deposited, wrapped by the fibrous tissue can also form fibrous nodules, fibrous nodules inside the lungs, as if a scar on the skin, if the scar is very clean, there is no great harm, that is, it does not look good, in general, but not to what is at risk. However, because the lungs are a direct external organs, that is, every moment will receive some pathogens in the air, pollutants, nodules in the lungs are actually irritated, easy to let him appear malignant, or organic waste exists around. And nodules because it is a fibrous foci, the surrounding tissue to be more hardened, if if it is dirty, there is dirt inside is very difficult to discharge. So the main thing to prevent nodules in the lungs is not to overstimulate them and cause other lesions to become malignant. The other is to be careful of secondary infections after too much waste has accumulated around the lungs, which should be treated accordingly.