When the cause of pneumoconiosis persists, such as pneumonia, tuberculosis, emphysema, etc., and is not treated or is left untreated for a long time, pneumoconiosis will recur when the right conditions are met. If the blister is removed by surgery alone, the blister is no longer there, but under the influence of many triggers, the blister will arise again. Similar to weeding the grass, although the grass is pulled out, if there are still seeds, sunlight and water, the grass will re-root and germinate, and it will come back again, so it is necessary to address the root cause of pneumoconiosis.