How long after radiation exposure do thyroid problems occur?
Hypothyroidism (see Hypothyroidism brochure). An underactive thyroid can develop from a few months to many years after radiation therapy. However, it is most likely that this will occur 2 – 3 years after the treatment. This condition is effectively and easily treated with thyroid hormone. Thyroid nodules (see Thyroid Nodule brochure) Thyroid nodules occur when there is a growth of thyroid cells into a lump within the thyroid gland. Thyroid nodules are usually noticed several years (typically 8 –12 years) after radiation treatment. They can be detected by a physician when he/she performs a physical examination of the neck and thyroid gland, or they can be seen using an ultrasound examination (picture of the thyroid gland obtained using sound waves). Thyroid cancer (see Thyroid Cancer brochure) Thyroid cancer may be found anywhere from 5 – 20 years after radiation treatment was given, although about 10 years after the treatment is the most common time. Can adults be affected by radiation
