A condition where the thyroid gland doesn't produce enough thyroid hormones. Slows down many of the body's functions. Hashimoto's thyroiditis is the most common cause in developed countries. Can occur at any age but is more common in older women.

• 1Hormone level testing
• 2Imaging (CT, MRI, ultrasound)
• 3Stimulation/suppression tests
• 4Autoantibody testing
• 5Genetic testing

Generally excellent with proper hormone replacement or suppression. Lifelong monitoring typically required. Complications preventable with good control.

• Screening for at-risk individuals
• Iodine sufficiency
• Avoidance of trigger medications
• Genetic counseling
• Lifestyle modifications