Differential Diagnosis for Nocturnal Left-Sided Chest Pain

Life-Threatening Causes to Exclude First

The American College of Cardiology recommends that cardiac causes, such as Acute Coronary Syndrome (ACS), be evaluated urgently despite the nocturnal pattern, as ACS can occur at rest without exertion, particularly in unstable angina or NSTEMI, presenting with retrosternal pressure building over minutes, radiating to the left arm/jaw/neck, with associated diaphoresis, dyspnea, or nausea 1, 4, 2
Pericarditis is a critical consideration given the nocturnal pattern, as it characteristically presents with sharp, pleuritic chest pain that worsens when lying supine and improves when leaning forward, potentially with a friction rub on examination 6, 3, 7
Aortic dissection presents with sudden-onset "ripping" or "tearing" chest pain radiating to the back, with pulse differentials between extremities—though less likely given the recurrent nocturnal pattern 6, 3, 7

Gastroesophageal reflux disease (GERD)/Esophagitis presents with burning retrosternal pain that is positionally related (worse when supine at night), may radiate to the left chest, and is typically relieved by antacids, according to the American College of Gastroenterology 8, 5
Esophageal spasm can mimic cardiac pain and may respond to nitroglycerin, making it a critical pitfall—nitroglycerin response should NOT be used as a diagnostic criterion for cardiac ischemia, as stated by the American Heart Association 1, 2, 3, 8, 5

Features suggesting cardiac origin, such as gradual onset over minutes with pressure/heaviness/squeezing quality, radiation to left arm, neck, or jaw, and associated diaphoresis, dyspnea, nausea, or syncope, require urgent evaluation, according to the American College of Cardiology 1, 4, 2
The American College of Cardiology also notes that features suggesting non-cardiac origin, such as sharp pain that increases with inspiration and lying supine, fleeting pain lasting only seconds, or pain reproducible with palpation or position changes, can help distinguish causes 1, 4, 2, 8

The American Heart Association recommends that an ECG should be obtained immediately to evaluate for ST-segment changes, new left bundle branch block, Q waves, or T-wave inversions 6, 3, 7, 5
A focused cardiovascular examination to assess for murmurs, friction rub, pulse differentials, or signs of heart failure is also necessary, according to the American College of Cardiology 6, 3, 7, 5
Cardiac troponin measurement is recommended if any suspicion of ACS exists, as stated by the American Heart Association 6, 5

The American College of Cardiology advises against using nitroglycerin response as a diagnostic test—esophageal spasm and other conditions also respond to nitroglycerin 1, 2, 3, 8, 5
The American Heart Association also warns against dismissing chest pain in women or elderly patients, as they frequently present with atypical symptoms including left-sided or sharp pain 1, 4, 2, 8

Immediate emergency department transfer is required if the patient is over 75 years with accompanying dyspnea, syncope, or acute delirium, according to the American College of Emergency Physicians 8
Any ECG abnormalities suggestive of ischemia, clinical evidence of ACS or other life-threatening causes, or patients with diabetes, renal insufficiency, or known cardiovascular disease also require immediate transfer, as stated by the American Heart Association 6, 3, 5, 8, 9