It is impossible to compare the severity between thyroid nodules and lung nodules.

Firstly, thyroid nodules and lung nodules occur in different organs. Lung nodules are mostly caused by inhalation of dust, pollutants, or smoke.

Thyroid nodules, on the other hand, often result from genetic factors, or issues with the patient’s own constitution leading to the formation of these nodules. Most lung nodules can be classified as benign or malignant through diagnostic tests, whereas it is often difficult to assess the nature of thyroid nodules with standard tests. Additional auxiliary examinations, such as PET-CT or SPECT, and biopsy pathology are needed to determine the nature of thyroid nodules.

Therefore, the approaches to observing and handling these two types of nodules are entirely different, and they cannot be compared.