Hypothyroidism is defined as low thyroid hormones, detected on blood serology, most commonly caused by Hashimoto's thyroiditis in the UK and iodine deficiency worldwide
Presentation: cold intolerance, weight gain, lethargy,
Diagnosis: low T3
Management: usually PO levothyroxine after considering underlying cause
Iodine deficiency
Medications
Amiodarone
Calcium salts- reduce absorption of levothyroxine
Written in 2025