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Hi Anonymous,
Thank you for your question and welcome to EmpowHer. Hyperthyroidism is often caused by the following:
■Immune system produces antibodies that cause the thyroid gland to overproduce thyroid hormone
■ Thyroid nodules or tumors
■Toxic uninodular goiter—a single nodule in the thyroid gland
■Toxic multinodular goiter—multiple areas in the thyroid gland which overproduce thyroid hormone
■ Subacute thyroiditis—inflammation of the thyroid gland (often later leads to hypothyroidism )
If you have any additional questions, you can check out our hyperthyroidism link here https://www.empowher.com/condition/hyperthyroidism.

I hope this helps answer your question.
Missie