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Nobody knows for sure what causes thyroid cysts or thyroid nodules (lumps) in general. People with a condition known as Hashimoto's disease, which is characterized by inflammation and incorrect functioning of the thyroid gland, might be at increased risk for thyroid nodules. Some experts think iodine deficiency, or not getting enough iodine in your diet, can also contribute to the development of thyroid nodules.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.