Hypothyroidism
Big picture
Hypothyroidism is a state of insufficient thyroid hormone effect. Clinically, the body “slows down”:
fatigue + cold intolerance + weight gain + constipation + dry skin + bradycardia = hypothyroidism until proven otherwise.
The most common cause in iodine-sufficient countries is Hashimoto autoimmune thyroiditis. The most important exam distinction is:
| Type | Problem | TSH | Free T4 |
|---|---|---|---|
| Primary hypothyroidism | Thyroid gland failure |
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