Hashimoto’s Thyroiditis
Most cases of hypothyroidism are caused by a condition called Hashimoto’s Thyroiditis. This is an autoimmune disorder where your immune system damages or destroys your thyroid gland. The damaged thyroid gland is then unable to produce sufficient levels of thyroid hormone to keep your body functioning properly. The word hypo means less than normal so in the case of hypothyroidism, less than normal function of the thyroid gland.
Postpartum Thyroiditis
Postpartum thyroiditis occurs in women after childbirth. Postpartum thyroiditis is also thought to be an autoimmune disorder but is often brought on by depleted thyroid stores and often resolves and is not a permanent condition.
Thyroid Surgery
Hypothyroidism can result from radioactive iodine treatment and surgery for hyperthyroidism or thyroid cancer. In both cases hypothyroidism can occur.
Iodine Deficiency
Severe iodine deficiency can cause hypothyroidism although this is very rare in first world countries. Your thyroid needs iodine to make the thyroid hormone thyroxine. Therefore severe iodine deficiency can cause hypothyroidism.
Age and thyroid function
Individuals over the age of 60 years are more likely to present with what is called ‘sub-clinical’ hypothyroidism which is characterized by elevated TSH with normal free thyroid concentrations. The clinical picture in older adults is more subtle than in younger individuals but thyroid issues can progress and affect health and cognitive function. So it is important that your health provider is knowledgeable and skilled in picking up on these nuances in the older adult population. If you or someone you know is experiencing symptoms of fatigue and mental decline, book a consult and get tested!