Hyperthyroidism (Overactive Thyroid) | Medical Encyclopedia

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Key Facts

Hyperthyroidism occurs when your thyroid gland produces too much of the hormone thyroxine (T4). Hyperthyroidism can accelerate your body's metabolism, causing unintentional weight loss and a rapid or irregular heartbeat.

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Pathophysiology

Excess thyroid hormone increases the metabolic rate and sensitivity of the sympathetic nervous system. Common causes include Graves' disease, toxic multinodular goiter, or a toxic adenoma.

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Symptoms & Clinical Features

Sudden weight loss, even when your appetite and food intake remain the same.

Rapid heartbeat (tachycardia) and palpitations.

Increased appetite.

Nervousness, anxiety, and irritability.

Tremor — usually a fine trembling in the hands and fingers.

Sweating and increased sensitivity to heat.

Changes in menstrual patterns.

Fig 1.1: Clinical visualization of endocrine pathways related to hyperthyroidism (overactive thyroid).

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Diagnosis

Diagnosis is confirmed with low TSH and high Free T4/T3 levels. A radioactive iodine uptake test (RAIU) and thyroid scan help determine the cause.

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Diagnostic Pathway

Initial Screening

Symptom review and baseline hormonal blood tests.

Confirmatory Testing

Advanced diagnostic protocols (e.g., OGTT, MRI, Suppression tests).

Personalized Plan

Tailored treatment strategy based on clinical results.

Fig 2.1: Specialized clinical decision matrix for hyperthyroidism (overactive thyroid).

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Treatment & Management

Treatments include anti-thyroid medications (Methimazole, PTU), radioactive iodine therapy to shrink the gland, or surgery (thyroidectomy). Beta-blockers are often used to manage heart rate and tremors.

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