Frequently asked question: What causes a nodule in the thyroid gland?

A nodule in the thyroid gland arises when a group of cells starts to grow. The cells can be benign or malignant.
A nodule in your thyroid gland can also come from somewhere else. For example, it can be metastasis of a tumor somewhere else in the body or a lymphoma that is growing into your thyroid gland. Sometimes you get thyroid cancer because your throat was exposed to radiation in the past, for example, for the treatment of leukemia. The thyroid gland is extremely sensitive to this. The radiation can cause malignant cells to start growing.

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