A nodule is basically a growth; therefore it refers to a lump on the thyroid gland.  There may be one thyroid nodule or several.  Thyroid nodules are usually benign, but occasionally they may be cancerous. Some thyroid nodules produce excessive amounts of thyroid hormones.  This can become problematic because they can cause the thyroid gland to become over active.  These nodules are referred to as hot nodules.  On the other hand, cold nodules do not produce thyroid hormone. It is quite likely that you have one or more nodules growing on your thyroid gland without realizing it and without experiencing symptoms.  (Read More)

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