25/01/2026
Hyperthyroidism vs Hypothyroidism, Why Patients With Thyroid Disease Feel Completely Opposite
Overview 🧠
This comparison explains how excess or reduced thyroid hormones affect the body, using clear lab focused points that are easy to recall for exams and routine practice.
Hormone Pattern 🔬
• Hyperthyroidism: T3 and T4 high, TSH low
• Hypothyroidism: T3 and T4 low, TSH high (primary)
Metabolic Effect ⚡❄️
• Hyperthyroidism: Fast metabolism, heat intolerance, weight loss
• Hypothyroidism: Slow metabolism, cold intolerance, weight gain
Key Clinical Features ❤️
• Hyperthyroidism: Palpitations, tremors, anxiety, sweating
• Hypothyroidism: Fatigue, dry skin, constipation, sluggishness
Common Causes 📌
• Hyperthyroidism: Graves disease
• Hypothyroidism: Hashimoto thyroiditis
Exam Tip 📘
Low TSH usually indicates hyperthyroidism.
High TSH usually indicates primary hypothyroidism.