There are two main types of thyroid diseases:
noncancerous thyroid disease and thyroid cancer.

Noncancerous Thyroid Disease

Some thyroid diseases are caused by changes in the amount of thyroid hormones that enter the body from the thyroid gland. Doctors can screen for these with a simple blood test.

Noncancerous thyroid disease also includes lumps, or nodules, in the thyroid gland that are benign and not cancerous.

Thyroid Cancer

Thyroid cancer occurs when a lump, or nodule, in the thyroid gland is cancerous.

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