54-Year-Old with Hypothyroidism: Chest Pain + Hand Pain

Chest Pain in Hypothyroidism

1. Pericardial Effusion / Pericarditis

• Up to 30-50% of overtly hypothyroid patients develop pericardial effusions (Braunwald's Heart Disease; Tietz Textbook of Laboratory Medicine)
• The effusion is caused by accumulation of cholesterol-rich, protein-rich fluid
• Presents as dull retrosternal pressure/pain, dyspnea, and low voltage on ECG
• Cardiac tamponade is rare but has been reported
• Echocardiography is the diagnostic test of choice
• Effusions typically resolve within weeks to months after thyroid hormone replacement

2. Cardiovascular Hemodynamic Effects

• Cardiac output decreases by up to 30-40%
• Systemic vascular resistance increases by up to 30% - causing diastolic hypertension (in up to 20% of patients)
• Left ventricular diastolic dysfunction occurs (impaired relaxation)
• Ejection fraction declines at rest and during exercise
• Increased afterload raises myocardial oxygen demand, which can manifest as angina-like chest pain
• ECG may show: sinus bradycardia, low voltage, prolonged QT interval, predisposing to ventricular arrhythmia and torsades de pointes

3. Hypothyroid Pericarditis

• Hypothyroidism is a recognized metabolic cause of acute pericarditis (alongside uremia)
• Presents with sharp retrosternal pain, worsened by lying down, relieved by sitting up
• Managed by treating the underlying hypothyroidism + NSAIDs/aspirin
• (Textbook of Family Medicine 9e)

Hand/Wrist Pain in Hypothyroidism

1. Carpal Tunnel Syndrome (Most Likely)

• Occurs in up to 30% of hypothyroid patients (Bradley & Daroff's Neurology in Clinical Practice)
• Caused by glycosaminoglycan (myxedematous) deposits compressing the median nerve in the carpal tunnel
• Symptoms: pain, paresthesias, and numbness in hands - classically worse at night
• Screening for occult hypothyroidism in all carpal tunnel patients is reasonable
• Usually responds to correction of the thyroid disorder alone

2. Arthralgia and Myalgia

• Arthralgia, myalgia, and proximal muscle myopathy are well-documented in hypothyroidism (Tietz Textbook of Laboratory Medicine)
• Muscles may show structural changes on microscopy: loss of striations, edema, fiber swelling
• Plasma creatine kinase (CK) is often elevated - important diagnostic clue
• Myopathy tends to affect proximal muscles (shoulders, hips)

3. Myxedematous Infiltration

• Hypothyroidism causes deposition of glycosaminoglycans (hyaluronic acid) in connective tissue
• This leads to non-pitting edema, joint stiffness, and periarticular swelling contributing to hand pain

Differential Diagnoses to Consider

Key Investigations

1. TSH + Free T4 - confirm adequacy of current thyroid replacement
2. ECG - look for bradycardia, low voltage, prolonged QT
3. Echocardiogram - rule out pericardial effusion / cardiac dysfunction
4. CK, LDH - elevated in hypothyroid myopathy
5. Lipid panel - hypothyroidism causes dyslipidemia and cardiovascular risk
6. Nerve conduction studies - confirm carpal tunnel syndrome
7. Anti-TPO, anti-TG antibodies - if Hashimoto's not yet confirmed
8. CBC - hypothyroid patients can have normocytic or macrocytic anemia

Management Approach

• Optimize levothyroxine dose - most symptoms resolve with restoration of euthyroid state
• Target TSH 0.5-2.5 mIU/L for symptomatic patients
• If pericardial effusion confirmed - monitor; expect resolution with thyroid replacement
• Carpal tunnel - splinting + thyroid optimization; surgical release only if persistent after euthyroidism restored
• If ischemic chest pain suspected - treat cardiovascular risk factors (especially dyslipidemia)
• If pericarditis confirmed - aspirin/NSAIDs + treat underlying hypothyroidism

Sources: Braunwald's Heart Disease 12e | Tietz Textbook of Laboratory Medicine 7e | Bradley & Daroff's Neurology in Clinical Practice | Textbook of Family Medicine 9e | Barash Clinical Anesthesia 9e