Hyperthyroidism occurs when the thyroid produces excess hormones, and can develop when something affects the entire gland or just a single nodule. Some causes of an overactive thyroid are Graves' disease, inflammation, overactive thyroid nodules, overconsumption of thyroid supplements, and pregnancy. Postpartum thyroiditis, excess consumption of iodine, and some antiarrhythmic drugs can also lead to hyperthyroidism.

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