Pneumoconiosis is a very common type of occupational disease, caused by many complicated factors. This disease primarily occurs because patients have been exposed to dusty environments for a long period. This disease has a very long course, with the early symptoms in patients mainly being mild coughing. Many patients do not take it seriously initially. As the condition gradually worsens, patients may develop lung infections. Subsequent symptoms become more severe, including coughing, phlegm, shortness of breath, weight loss, and decreased appetite, among others. In severe cases of infection, patients may experience intense coughing, which can lead to bleeding from the capillaries on the surface of the bronchi. Thus, people with pneumoconiosis may sometimes experience coughing up blood.