03/13/2026
Hyperthyroidism is a condition in which the thyroid gland produces excess thyroid hormones (T3 and T4). These hormones regulate the body’s metabolism, so when their levels become too high, the metabolic rate increases, affecting many organs including the heart, brain, muscles, and digestive system.
The most common cause is Graves' disease, an autoimmune condition where antibodies stimulate the thyroid gland to produce excessive hormones. Other causes include Toxic multinodular goiter, thyroiditis, toxic adenoma, and excessive iodine intake.
Common Symptoms
Patients with hyperthyroidism may experience: • Unexplained weight loss despite increased appetite
• Palpitations and rapid heartbeat (tachycardia)
• Hand tremors
• Heat intolerance and excessive sweating
• Anxiety, nervousness, and irritability
• Muscle weakness and fatigue
• Frequent bowel movements
In some cases, especially in Graves’ disease, patients may develop eye signs such as bulging eyes (exophthalmos) and diffuse thyroid enlargement (goiter).
Diagnosis
Hyperthyroidism is diagnosed with thyroid function tests showing:
• Low TSH
• Elevated Free T4 and/or T3
Additional tests such as thyroid antibody tests, ultrasound, or radioactive iodine uptake scan may help determine the underlying cause.
Treatment
Management options include: • Antithyroid medications (e.g., Methimazole, Propylthiouracil)
• Radioactive iodine therapy to reduce thyroid activity
• Beta-blockers to control symptoms such as palpitations and tremors
• Surgery (thyroidectomy) in selected cases
If left untreated, hyperthyroidism can lead to serious complications such as Atrial fibrillation, osteoporosis, heart failure, and the life-threatening emergency known as Thyroid storm.
Early recognition and proper treatment are essential to prevent complications and restore normal thyroid function.
💬 Question for you:
Which laboratory finding is most characteristic of hyperthyroidism — low TSH or high TSH? 👇
