What is the differential diagnosis of chest tightness?

Differential Diagnosis of Chest Tightness

Life-Threatening Causes Requiring Immediate Exclusion

Acute coronary syndrome (ACS) is the most critical diagnosis to exclude first, presenting as retrosternal pressure, squeezing, or tightness that builds gradually over minutes and may radiate to the left arm, jaw, or neck. 1, 2

• Acute myocardial infarction causes substernal pressure or heaviness that develops over several minutes, often accompanied by diaphoresis, dyspnea, nausea, or syncope; approximately 30–40% present with a normal initial ECG, so serial testing is mandatory. 1, 2

• Unstable angina produces crescendo chest tightness at rest or with minimal exertion, signaling imminent myocardial infarction and requiring urgent coronary evaluation. 1, 3

• Acute aortic dissection presents with sudden maximal "ripping" or "tearing" chest or back pain, pulse differentials between extremities (~30% of cases), systolic blood pressure difference >20 mmHg between arms, and a new aortic regurgitation murmur (40–75% of type A dissections). 1, 2

• Pulmonary embolism manifests as sudden dyspnea with pleuritic chest pain that worsens on inspiration, tachycardia in >90% of patients, and identifiable risk factors (recent surgery, immobilization, malignancy, oral contraceptives). 1, 2, 4

• Tension pneumothorax causes dyspnea and sharp chest pain intensifying with inspiration, unilateral absent breath sounds, hyperresonant percussion, tracheal deviation, and hemodynamic instability. 1, 2, 4

• Cardiac tamponade produces pleuritic chest pain worsening when supine, Beck's triad (jugular venous distension, hypotension, muffled heart sounds), and pulsus paradoxus >10 mmHg. 2, 5

• Esophageal rupture (Boerhaave syndrome) follows forceful vomiting with severe chest pain, subcutaneous emphysema of the neck or chest, and concurrent pneumothorax in ~20% of cases. 1, 2, 4

Serious Cardiac Causes (Non-ACS)

• Acute pericarditis presents with sharp, pleuritic chest pain that worsens when lying supine and improves when sitting or leaning forward, often accompanied by fever and a pericardial friction rub; ECG shows diffuse concave ST-elevation with PR-segment depression. 1, 2, 6

• Myocarditis causes chest pain with fever and signs of heart failure (S3 gallop, pulmonary crackles); clinical presentation mimics ACS, necessitating cardiac troponin measurement for differentiation. 1, 2

• Valvular heart disease (aortic stenosis, aortic regurgitation, hypertrophic cardiomyopathy) produces persistent chest tightness; aortic stenosis presents with a systolic murmur and delayed carotid pulse (pulsus tardus-parvus). 1, 6

• Stable angina (chronic coronary syndrome) causes retrosternal pressure triggered by physical exertion or emotional stress, lasting several minutes and relieved by rest. 6, 3

Pulmonary Causes

• Pneumonia produces fever with localized, often pleuritic chest pain; examination reveals regional dullness, egophony, and possibly a pleural friction rub. 1, 2, 7

• Pleuritis generates sharp chest pain that worsens with deep inspiration. 1, 7

• Non-tension pneumothorax causes dyspnea and chest pain worsening with inspiration, unilateral absence of breath sounds, and hyperresonant percussion. 1, 4, 7

• Pulmonary hypertension shows constant pain unrelated to respiratory movements. 7

Gastrointestinal Causes

Gastrointestinal disorders account for 10–20% of chest pain presentations in outpatient settings. 2, 6

• Gastroesophageal reflux disease (GERD)/esophagitis produces burning retrosternal pain related to meals or occurring at night, worsened by stress, and often relieved by antacids. 1, 2, 6, 3, 8

• Esophageal motility disorders (achalasia, distal esophageal spasm, nutcracker esophagus) generate squeezing retrosternal pain or spasm, frequently accompanied by dysphagia; esophageal spasm may respond to nitroglycerin, so nitroglycerin response should not be used diagnostically. 1, 2, 6

• Peptic ulcer disease manifests as epigastric pain radiating to the chest with epigastric tenderness on examination. 1, 2

• Gallbladder disease presents with right-upper-quadrant tenderness and a positive Murphy sign, with possible chest discomfort. 1, 2

Musculoskeletal Causes

Musculoskeletal causes account for 43% of chest pain in general practice after cardiac causes are excluded. 2, 6

• Costochondritis/Tietze syndrome is identified by tenderness over costochondral joints; pain is reproduced by direct pressure and influenced by breathing, turning, twisting, or bending of the torso; however, up to 7% of patients with reproducible chest-wall tenderness still have ACS. 1, 2, 6

• Chest wall pain is localized to a very limited area, affected by palpation, breathing, turning, twisting, or bending. 1, 2

Psychiatric Causes

Psychiatric causes account for 11% of chest pain in general practice and 8% in emergency departments. 2, 6

• Panic disorder and anxiety frequently present with chest pain together with dyspnea, palpitations, and diaphoresis; cognitive-behavioral therapy reduces chest-pain frequency by ~32% over three months. 1, 2, 6, 3

• Depression is associated with chronic chest pain and plays a significant role in pain perception and severity, irrespective of the underlying cause. 6, 3

Dermatologic Causes

• Herpes zoster produces unilateral dermatomal pain triggered by touch, described as burning or tingling, that does not cross the midline; a vesicular rash follows the affected dermatome, often preceded by pain. 1, 2

Critical Diagnostic Pitfalls to Avoid

• Do not rely on nitroglycerin response to differentiate cardiac from non-cardiac chest pain; esophageal spasm and other conditions may also improve. 1, 2, 5, 6

• Sharp or pleuritic chest pain does not exclude ACS; approximately 13% of patients with pleuritic-type pain have acute myocardial ischemia. 1, 2, 5

• A normal physical examination does not exclude ACS; uncomplicated myocardial infarction can present with entirely normal findings. 1, 2, 5

• Chest-wall tenderness does not rule out ACS; up to 7% of patients with reproducible tenderness still have acute coronary syndrome. 2, 6

• A normal initial ECG does not exclude ACS; 30–40% of acute myocardial infarctions present with a normal or nondiagnostic ECG. 2, 5

Special Population Considerations

• Women are at higher risk for underdiagnosis and more frequently present with jaw/neck pain, nausea, fatigue, dyspnea, epigastric discomfort, or back pain rather than classic chest pressure; use sex-specific troponin thresholds (>16 ng/L for women vs >34 ng/L for men) to avoid missing ~30% of women with STEMI. 1, 2, 5, 3

• Older adults (≥75 years) may present atypically with isolated dyspnea, syncope, acute delirium, or unexplained falls without classic chest pain. 1, 2, 5

• Patients with diabetes frequently have atypical or silent ischemic presentations, including vague abdominal symptoms, confusion, or isolated dyspnea, and carry a higher risk of silent myocardial ischemia. 5, 6

Algorithmic Approach to Chest Tightness

1. Obtain a 12-lead ECG within 10 minutes to detect STEMI (≥1 mm ST-elevation in contiguous leads), ST-depression, T-wave inversions, or pericarditis patterns. 1, 2, 5

2. Draw high-sensitivity cardiac troponin immediately; it is the most sensitive and specific biomarker for myocardial injury. 1, 2, 5

3. If STEMI is present, activate STEMI protocol immediately; target door-to-balloon time <90 minutes for primary PCI or door-to-needle time <30 minutes for fibrinolysis. 2, 5

4. If ST-depression, T-wave inversions, or elevated troponin without ST-elevation, admit to coronary care unit, start dual antiplatelet therapy (aspirin + P2Y12 inhibitor) and anticoagulation, and arrange urgent coronary angiography. 2, 5

5. If initial ECG and troponin are normal, repeat high-sensitivity troponin at 1–3 hours (or conventional troponin at 3–6 hours) because a single normal result does not exclude ACS. 2, 5

6. Obtain serial ECGs every 15–30 minutes if clinical suspicion remains high to capture evolving ischemic changes. 2, 5

7. Measure vital signs in both arms; a systolic blood-pressure difference >20 mmHg between arms suggests aortic dissection. 2, 5

8. Perform focused cardiovascular examination for diaphoresis, tachypnea, pulmonary crackles, S3 gallop, new murmurs, pericardial friction rub, unilateral absent breath sounds, pulse differentials, and jugular venous distension. 1, 2, 5

9. If pain is reproducible with palpation of costochondral joints, diagnose costochondritis and prescribe NSAIDs (ibuprofen 600–800 mg three times daily for 1–2 weeks), but remember that 7% of such patients still have ACS. 2, 6

10. If pain is meal-related and burning, initiate a PPI trial for 4–8 weeks; if symptoms persist, consider upper endoscopy and esophageal functional testing. 6, 8

11. If no organic cause is identified, evaluate for anxiety, depression, or panic disorder and refer for cognitive-behavioral therapy. 6, 8

12. In patients with cardiovascular risk factors (age ≥60 years, hypertension, hyperlipidemia, diabetes, smoking) even with normal ECG/troponin, schedule stress testing or CT coronary angiography within 72 hours. 5, 6