A chest CT generally has no effect on thyroid nodules. Chest CT is a tomography scan of the body using radiation. Chest CT is a tomographic scan of the body using radiation, which can cause some radiation to the body, but it does not have a direct effect on the thyroid nodules themselves. The radiation from a single chest CT is very low, but it is not recommended that tests such as chest CTs be done frequently. If you have thyroid nodules, you can use a lead plate to protect your thyroid during a chest CT. Usually chest CT radiation alone does not affect thyroid nodules. Thyroid nodules may be related to environmental, dietary, and genetic factors. Patients suffering from thyroid nodules should go to the hospital in time to clarify the nature of the pathology and under the guidance of the doctor for targeted treatment. When chest CT is needed, professional doctors should be consulted and under the guidance of doctors.