Pleuritic chest pain - differential

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Pleuritic Chest Pain - Differential Diagnosis

Pleuritic chest pain is sharp pain that worsens with inspiration, coughing, or movement. It arises when the parietal pleura (which is pain-sensitive, unlike the visceral pleura) is inflamed or irritated, or from adjacent musculoskeletal/nerve structures. The key clinical task is to exclude life-threatening causes first before attributing the pain to benign ones.

Pathophysiology

The parietal pleura is innervated by intercostal nerves (peripheral portions) and the phrenic nerve (central/diaphragmatic pleura). Inflammation of the pleura causes friction between the layers, generating sharp, localised pain that spikes with any movement that stretches the pleura - inspiration, coughing, sneezing, or twisting. Pain from central diaphragmatic pleura is typically referred to the shoulder tip (C3-C5 dermatome).

Structured Differential by Category

1. MUST NOT MISS (Life-Threatening)

Diagnosis	Key Features	Why Pleuritic?
Pulmonary Embolism (PE)	Dyspnea + pleuritic pain in 66% of cases; tachycardia; risk factors (immobility, cancer, OCP, post-op); may have unilateral leg swelling	Pulmonary infarction irritates adjacent pleura
Tension Pneumothorax	Sudden onset, ipsilateral absent breath sounds, tracheal deviation, haemodynamic collapse	Visceral/parietal pleural separation + friction
Myocardial Infarction / ACS	Critical pitfall - 13% of patients with pleuritic pain have acute myocardial ischaemia; sharp features do NOT exclude ischaemia	Epicardial/pericardial involvement; inferior MI with diaphragmatic irritation
Aortic Dissection	Sudden severe tearing pain, pulse/BP differentials, hypertension history	Haemothorax or haemopericardium irritating pleura
Boerhaave Syndrome (Oesophageal Rupture)	Preceded by vomiting; subcutaneous emphysema; Mackler's triad	Mediastinal contamination with pleural spillage

PE is the most common life-threatening cause, found in 5-21% of ED patients presenting with pleuritic chest pain. - Fuster and Hurst's The Heart, 15th Ed.

2. COMMON / HIGH-PROBABILITY

Diagnosis	Key Features
Pleurisy (viral/idiopathic)	Young patient, preceding URTI, no effusion; Coxsackievirus, RSV, influenza, adenovirus are common culprits
Pneumonia with pleuritis	Fever, cough, purulent sputum, consolidation on CXR; parapneumonic effusion may co-exist; crackles + bronchial breathing
Pericarditis	Retrosternal/left chest pain radiating to trapezius ridge; worsened lying flat, relieved by leaning forward; pericardial rub; ECG: diffuse saddle-shaped ST elevation + PR depression
Pneumothorax (spontaneous)	Sudden unilateral sharp pain + dyspnea; young tall males (primary); underlying COPD/Marfan's (secondary); absent breath sounds
Pleural Effusion	Pain from pleural inflammation; dyspnea; dullness to percussion; decreased tactile fremitus; egophony at upper border
Musculoskeletal	Costochondritis (Tietze syndrome) - localised sternal/costal tenderness reproduced by palpation; rib fracture - trauma history, point tenderness; strained intercostal muscles

3. IMPORTANT ALTERNATIVES

Diagnosis	Key Features
Dressler's Syndrome	2-6 weeks after MI or cardiac surgery; fever + pleuritic pain + pericardial rub + elevated ESR; autoimmune mechanism - Frameworks for Internal Medicine
Post-pericardiotomy Syndrome	After cardiac surgery; same mechanism as Dressler's
Pulmonary Infarction	Often a consequence of PE; haemoptysis + wedge-shaped opacity on CXR (Hampton's hump)
Malignant Pleural Disease	Primary (mesothelioma) or metastatic; dull ache or pleuritic; effusion often bloody
Tuberculosis Pleuritis	Unilateral exudative effusion; lymphocyte-predominant; positive ADA; systemic symptoms
Subphrenic / Hepatic Abscess	Intra-abdominal process producing diaphragmatic pleural irritation; referred shoulder tip pain; fever
Empyema	Purulent pleural infection; follows pneumonia; fever, toxicity, reduced chest expansion

4. AUTOIMMUNE / SYSTEMIC

Diagnosis	Key Features
SLE Pleuritis	Most common pulmonary manifestation of SLE; bilateral effusions; anti-dsDNA/ANA positive; serositis also in pericardium
Rheumatoid Arthritis	Pleuritis with exudative effusion; very low glucose in fluid is characteristic
Drug-Induced Lupus	Pleuritis after hydralazine, procainamide, isoniazid, minocycline

5. LESS COMMON / DON'T FORGET

Diagnosis	Notes
Radiation Pneumonitis	4-12 weeks after thoracic radiotherapy; dyspnea + cough + low-grade fever + pleuritic pain; CT required to characterise
Sarcoidosis	About 50% of cases with pleural involvement have pleuritic pain or dyspnea - Murray & Nadel's Textbook of Respiratory Medicine
Cervical Radiculopathy	Referred pain from C4-T1 nerve roots; exacerbated by neck movements (foraminal compression), not inspiration per se
Herpes Zoster	Pre-rash phase can mimic pleuritic pain; dermatomal distribution; allodynia
Mesothelioma	Asbestos exposure; insidious onset; progressive dull-pleuritic pain
Pneumomediastinum	Spontaneous (young patients with Valsalva) or secondary (Boerhaave); subcutaneous emphysema; Hamman's sign (mediastinal crunch) - Rosen's Emergency Medicine

Diagnostic Approach Framework

Pleuritic chest pain
        |
        ├── ABCs / Haemodynamically unstable?
        |         YES → Tension PTX, massive PE, tamponade, dissection
        |
        ├── ECG (within 10 min)
        |    • ST elevation + PR depression → Pericarditis
        |    • S1Q3T3 / sinus tachycardia → PE
        |    • STEMI pattern → ACS
        |
        ├── CXR
        |    • Absent lung markings → Pneumothorax
        |    • Consolidation/effusion → Pneumonia/parapneumonic
        |    • Hampton's hump / Westermark sign → PE
        |    • Globular cardiac shadow → Pericardial effusion
        |    • Pleural thickening → Mesothelioma/TB
        |
        ├── Troponin → exclude ACS
        |
        ├── D-dimer + Wells score → if PE suspected
        |
        └── Consider: thoracentesis, echo, CT-PA, CT chest

Key Clinical Pearls

Sharp, pleuritic character does NOT exclude ACS - 13% of patients presenting with pleuritic pain have acute myocardial ischaemia. Always get an ECG and troponin early.
PE is the most dangerous common diagnosis - present in up to 1 in 5 ED presentations with pleuritic pain. Use validated decision rules (Wells, PERC, Geneva) before dismissing it.
Fever + pleuritic pain + dyspnea - this triad points strongly toward pneumonia/parapneumonic effusion at the top of the differential. - Symptom to Diagnosis, 4th Ed.
Pericarditis distinguishing feature: pain that is relieved by sitting up and leaning forward (reduces pericardium-diaphragm contact). Radiation to the trapezius ridge is nearly pathognomonic.
Musculoskeletal causes are common but require active exclusion of serious pathology first - do not anchor on reproducible chest wall tenderness, as 15% of patients with reproducible tenderness have PE or ACS. - Braunwald's Heart Disease
Subdiaphragmatic pathology (abscess, hepatitis, splenic infarct) should be considered when pleuritic pain is basal and associated with abdominal signs.

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