Differential Diagnosis of Chest Pain: A Clinical Overview

Differential Diagnosis of Chest Pain: A Clinical Overview

The evaluation of acute chest discomfort requires a systematic differential diagnosis, as the syndrome associated with ischemic heart disease is broader than chest pain itself, encompassing symptoms like tightness, pressure, and discomfort in the chest, arms, neck, jaw, upper back, and abdomen, as well as dyspnea and nausea (anginal equivalents) [7]. Clinicians must consider both cardiac and non-cardiac etiologies [1].

Cardiac Causes

The primary differential diagnoses include conditions that directly affect the myocardium or major vessels.

1. Acute Coronary Syndrome (ACS) / Myocardial Ischemia

• Pain Characteristics: Typically presents as substernal discomfort, often described as pressure, tightness, or heaviness [7]. Classically, it is initiated by exertion or stress and is relieved by rest or nitroglycerin [4], [6].
• Presentation Nuances: While typical angina is defined by these characteristics, the presentation can be highly variable, particularly in females, the elderly, or patients with diabetes [4].
• Associated Findings: The sudden onset of symptoms coupled with diaphoresis should always raise concern for a cardiovascular cause [4].

2. Aortic Dissection

• Pain Characteristics: The classic symptom is a severe, often sharp pain that characteristically radiates to the back [5].

3. Acute Pericarditis

• Pain Characteristics: The pain is typically pleuritic and tends to worsen when the patient lies flat or moves [2], [5].
• Localization: While often retrosternal, the pain may be localized to the left anterior chest and can radiate to the neck, shoulders, and arms, sometimes following the trapezius ridge [2].
• Distinguishing Features: Recognition may be aided by the pain not being relieved by rest or nitroglycerin, and by exacerbation with deep inspiration or movement [5].

4. Pulmonary Embolism (PE)

• Pain Characteristics: While dyspnea is the cardinal symptom, chest pain can be present [5].
• Distinguishing Features: Pleuritic pain suggests pulmonary infarction, and a history of pain exacerbation with inspiration, along with a pleural friction rub, helps differentiate it from angina pectoris [5].

5. Pulmonary Hypertension

• Pain Characteristics: Severe pulmonary hypertension can cause exertional chest pain that mimics angina pectoris [5]. This pain is thought to result from right ventricular ischemia that develops during physical exertion [5].
• Associated Findings: Exertional dyspnea, dizziness, and syncope may also occur [5].

Non-Cardiac Causes

Several non-cardiac conditions can present with chest pain that requires careful differentiation from ischemic heart disease [1], [2].

1. Gastroesophageal Reflux (GERD)

• Pain Characteristics: GERD is listed as a differential diagnosis for chest pain [2].

2. Musculoskeletal Conditions

• Examples: Costochondritis and general musculoskeletal pain are common causes of chest pain [2].
• Pain Characteristics: Pain reproduced with palpation is often indicative of a noncardiac source [4].

3. Pneumonia with Pleurisy

• Pain Characteristics: Pleuritic pain is a common presentation [2].

4. Other Systemic/Local Causes

• Conditions: Intraabdominal processes, pneumothorax, and herpes zoster pain are other considerations when assessing chest pain [2].
• Autoimmune/Malignancy: A history suggesting an autoimmune disorder or known malignancy may suggest specific, nonidiopathic etiologies [2].

Summary of Pain Characteristics

The following table synthesizes the key differential diagnoses and their characteristic pain patterns based on the provided context.

Condition	Typical Pain Quality/Location	Key Modifying Factors	Associated Physical/Clinical Clues
ACS/Myocardial Ischemia	Substernal discomfort, pressure, tightness, or heaviness [7].	Worsens with exertion/stress; relieved by rest/nitroglycerin [4], [6].	Sudden onset with diaphoresis [4].
Aortic Dissection	Severe, often sharp pain radiating to the back [5].	N/A	N/A
Acute Pericarditis	Pleuritic, often retrosternal, radiating to the neck, shoulders, or arms [2].	Worsens when lying flat or with deep inspiration/movement [2], [5].	Pericardial friction rub; ECG changes (PR-segment depression) [5].
Pulmonary Embolism (PE)	Pleuritic pain [5].	Exacerbation with inspiration [5].	Dyspnea is the cardinal symptom; pleural friction rub [5].
Severe Pulmonary Hypertension	Exertional chest pain mimicking angina [5].	Develops during exertion [5].	Parasternal lift, loud pulmonary component of second heart sound, RV hypertrophy on ECG [5].
Costochondritis/Musculoskeletal Pain	Pain reproducible with palpation [2].	N/A	N/A
GERD	Chest discomfort [2].	N/A	N/A

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Note on Diagnostic Approach: While the history and physical examination are crucial for narrowing the differential diagnosis [4], [12], the context emphasizes that clinical assessment alone is insufficient to rule in or rule out ACS [12]. Therefore, combining the clinical evaluation with ECG findings and high-sensitivity troponin measurements is critical for accurate diagnosis [3], [13].