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Biochemical hyperthyroidism is identified by low TSH with elevated free T4 and/or T3; thyroid tests are repeated after treatment changes to assess response. Causes include Graves disease, nodular thyroid disease, thyroiditis, and certain drugs or iodine exposure. Management may address adrenergic symptoms with a beta-blocker, reduce hormone production with thionamides, or use radioactive iodine as definitive therapy. The lesson also covers iodine’s short-term role, emergency management of thyroid storm, treatment considerations in pregnancy, and follow-up after therapy. Medication risks and patient counseling are important parts of care, including recognizing symptoms that warrant urgent assessment.