Nodules in the lungs are associated with a variety of factors, such as pneumonia, tuberculosis, lung parasites, mycobacterial infections and lung tumours, all of which can lead to nodules in the lungs, and the doctor can often clarify the cause by taking a medical history, combined with a physical examination. If the nodules are small and there are no specific clinical symptoms, no specific treatment can be given for the time being and regular follow up can be done. If the lung nodules are large, they should receive treatment as soon as possible to avoid deterioration.