Physical Examination Findings in Graves' Disease
In a typical presentation of Graves' disease, you should identify a diffuse homogeneous goiter, signs of hyperthyroidism (tachycardia, tremor, warm moist skin), and in approximately 50% of cases, ophthalmopathy with lid retraction, proptosis, or periorbital soft tissue changes 1, 2.
Thyroid Examination
The thyroid gland in Graves' disease presents with characteristic features:
- Diffuse, bilateral goiter extending to the isthmus - homogeneous enlargement without discrete nodules 2
- The gland is typically smooth and non-tender on palpation
- A thyroid bruit may be audible, reflecting increased vascularity
- The goiter size varies but is consistently diffuse rather than nodular 3
Ophthalmologic Findings (Graves' Orbitopathy)
Approximately 50% of patients with Graves' hyperthyroidism have signs and/or symptoms of ophthalmopathy, though only 5% develop severe disease 1. The key physical findings include:
Lid and Periorbital Changes
- Lid retraction (most common finding) - upper eyelid pulled back exposing sclera above the iris
- Eyelid swelling and erythema
- Periorbital edema
Ocular Surface and Soft Tissue
- Conjunctival redness and chemosis (conjunctival swelling)
- Caruncular swelling
- Corneal exposure in severe cases
Proptosis (Exophthalmos)
- Bilateral forward protrusion of the eyes
- Normal upper limits vary by race/sex 1:
- White: Female 19mm / Male 21mm
- African American: Female 23mm / Male 24mm
- Asian: Female 16mm / Male 17mm (Thai) or 18.6mm (Chinese)
- Proptosis ≥3mm above normal is considered moderate severity
Extraocular Muscle Involvement
- Diplopia - can be transient, inconstant, or constant depending on severity
- Pain with eye movement or in primary gaze (indicates active disease)
- Restricted eye movements, particularly upward gaze
Clinical Activity Score (CAS) ≥3 indicates active ophthalmopathy requiring consideration of immunosuppressive therapy 1.
Systemic Hyperthyroid Signs
The physical examination reveals classic hyperthyroid features 3:
- Cardiovascular: Tachycardia, wide pulse pressure, systolic flow murmur, atrial fibrillation (especially in older patients)
- Neuromuscular: Fine tremor of outstretched hands, hyperreflexia with brisk deep tendon reflexes, proximal muscle weakness
- Dermatologic: Warm, moist, smooth skin; palmar erythema; onycholysis
- Pretibial myxedema (infiltrative dermopathy) - rare but specific finding, presenting as non-pitting edema over the shins with thickened, hyperpigmented skin 3
Atypical Presentations
Be alert for atypical manifestations that may delay diagnosis 4:
- "Apathetic thyrotoxicosis" in elderly patients - presenting with lethargy, depression, and weight loss rather than hyperactivity
- Isolated right heart failure from pulmonary hypertension
- Jaundice from hepatic dysfunction
- Behavioral changes or declining academic performance in children 5
Clinical Pitfalls
In typical presentations (young female, homogeneous goiter, ophthalmopathy), complementary examinations are not needed for etiologic diagnosis 2. However, the absence of ophthalmopathy does not exclude Graves' disease - 50% of patients lack eye findings 1.
Lid retraction alone or with only mild conjunctival erythema and eyelid swelling does not constitute active Graves' orbitopathy requiring immunosuppressive treatment 1. Use the structured CAS scoring system to determine disease activity.
When examining for proptosis, always compare measurements to race- and sex-specific norms, as significant variation exists 1. Document baseline measurements for future comparison during treatment.