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<p>age of 20. At this age, thyroid nodules are more likely to be malignant than benign.</p>

<p><big>Causes</big></p>
<p>Thyroid cancers are thought to be related to a number of environmental and genetic predisposing factors, but significant uncertainty remains regarding their causes.</p>

<p>Environmental exposure to <a href="page.php?w=ionizing_radiation">ionising radiation</a> from both natural background sources and artificial sources is suspected to play a significant role, and significantly increased rates of thyroid cancer occur in those exposed to</p><p>
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