![]() Some people with subclinical hypothyroidism can progress to develop hypothyroidism. Subclinical hypothyroidism is more common than typical hypothyroidism (14,21). ![]() Subclinical hypothyroidism is diagnosed through laboratory tests, which indicate that the thyroid stimulating hormone (TSH-the hormone that signals from the brain to the thyroid) is above the normal range (20). On laboratory blood tests their thyroid hormones (T4) are shown to be within normal ranges (20). People with subclinical hypothyroidism do not usually have any of the typical symptoms. ![]() Hypothyroidism can be diagnosed in two forms: subclinical hypothyroidism and hypothyroidism. About 1 in 5 people with postpartum thyroiditis develop hypothyroidism that is lifelong (4,13). Postpartum thyroiditis affects about 7 in 100 pregnancies, and should be managed with the help of a healthcare provider (12). Symptoms of postpartum thyroiditis are usually mild and can include hyperthyroidism (an overactive thyroid) and/or hypothyroidism symptoms. Postpartum thyroiditis usually begins between two and six months after childbirth, and generally lasts up to one year (12). Pregnancy can cause a disorder called postpartum thyroiditis. Medication, such as lithium, can also cause hypothyroidism as a side effect (11). This can happen when someone is receiving treatment for hyperthyroidism or having surgery or radiation around the area of the thyroid (7). Hypothyroidism can also develop when the thyroid is physically damaged. Physical or medical damage to the thyroid It’s not yet clear what causes this to happen. ![]() This disease causes a person’s immune system to attack their thyroid gland, preventing it from working properly (10). In places where people have access to enough iodine in their diet, hypothyroidism is most often caused by an autoimmune disease called Hashimoto's disease (10). This can cause hypothyroidism and a goiter (a swollen and enlarged thyroid gland) to develop (3,9). Without enough iodine in the diet, people can develop an iodine deficiency. In some places where malnutrition or iodine-deficient soil exists, people are not able to get enough iodine (a natural mineral) in their diets. This can happen for a few different reasons: When someone has hypothyroidism, their thyroid gland doesn’t produce enough of these hormones. The thyroid gland produces two main hormones: thyroxine (T4) and triiodothyronine (T3).
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