An increase in the number of lung nodules is usually due to the fact that the cause of the nodules has not been controlled, which aggravates the symptoms. 1. Lung nodules can be caused by bacterial and fungal infections, such as Mycobacterium tuberculosis, etc. If the nodules are caused by infections, it usually indicates that the infections are not controlled in time or the antibiotics used are incorrect, which worsens the symptoms. 2. If the lung nodules are caused by tumor metastasis, the increase of lung nodules usually indicates that the tumors inside or outside the lungs are not controlled, or the treatment plan is not appropriate, so that the metastatic foci in the lungs are increasing. Lung nodules may also be related to other causes, so it is recommended to consult a doctor in time to clarify the cause of the disease and then actively diagnose and treat the disease.