Hyperthyroidism Symptoms: Complete Checklist for Overactive Thyroid

Recognizing Thyrotoxicosis

Hyperthyroidism (overactive thyroid) accelerates metabolism across multiple systems. Symptoms vary by severity, age, and duration.

Common Signs & Symptoms

Geriatric Presentation ("Apathetic Hyperthyroidism")

Older adults may present atypically: weight loss, anorexia, depression, atrial fibrillation, heart failure, confusion—without classic hyperadrenergic signs.

When to Test

TSH (suppressed) + free T4/T3 confirms. Check TSH-receptor antibodies (TRAb) for Graves'; thyroid scan for nodular disease.

Urgent Red Flags (Thyroid Storm)

• Fever >38.5°C, tachycardia >130, agitation/delirium, nausea/vomiting, diarrhea, jaundice
• Precipitants: infection, surgery, trauma, DKA, iodine load, labor
• Medical emergency—ICU admission, high-dose antithyroid drugs, beta-blockers, steroids, iodine.

Early diagnosis prevents complications (osteoporosis, AFib, storm). Simple blood test; highly treatable.

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System	Manifestations
Neuropsychiatric	Nervousness, anxiety, irritability, emotional lability, insomnia, tremor (fine, hands outstretched), hyperreflexia
Cardiovascular	Tachycardia, palpitations, atrial fibrillation (esp. >60), systolic hypertension, wide pulse pressure, high-output heart failure
Thermoregulatory	Heat intolerance, excessive sweating, warm moist skin, low-grade fever
Weight/Metabolic	Weight loss despite increased appetite (or weight gain if hyperphagia dominates), increased BMR
Gastrointestinal	Frequent bowel movements, diarrhea, malabsorption, nausea
Musculoskeletal	Proximal myopathy (difficulty rising, climbing stairs), osteopenia/osteoporosis, thyrotoxic periodic paralysis (Asian males)
Dermatologic	Thin skin, fine hair, alopecia, onycholysis (Plummer's nails), pretibial myxedema (Graves')
Reproductive	Oligomenorrhea/amenorrhea, reduced fertility, decreased libido
Ocular (Graves' orbitopathy)	Exophthalmos (proptosis), lid lag, stare, diplopia, periorbital edema, vision loss (compressive optic neuropathy)
Thyroid	Diffuse goiter (Graves'), toxic multinodular goiter, toxic adenoma; may have bruit