What Causes a Dull Ache Just Below the Chest?

Substernal discomfort—often described as a vague, dull ache or pressure located directly beneath the sternum—is a symptom that warrants careful clinical evaluation. While it may sometimes reflect benign, self-limiting conditions such as gastroesophageal reflux disease (GERD) or musculoskeletal strain, it can also signal serious underlying pathology.

Cardiac causes must be prioritized in the differential diagnosis. Angina pectoris—typically precipitated by exertion or emotional stress and relieved by rest or nitroglycerin—may present as central chest discomfort rather than sharp pain. Acute coronary syndromes, including myocardial infarction, can manifest with atypical symptoms, particularly in older adults, women, and individuals with diabetes, where substernal pressure or tightness may occur without classic radiating pain.

Gastrointestinal etiologies are common. GERD frequently produces burning or pressure-like sensations behind the sternum, often worsening after meals or when supine. Esophageal spasm or esophagitis may mimic cardiac pain, while peptic ulcer disease or gastritis can refer discomfort to the epigastric or retrosternal region. Hiatal hernia is another frequent contributor, especially when associated with postprandial fullness or regurgitation.

Musculoskeletal origins—including costochondritis, sternalis muscle strain, or Tietze syndrome—often produce localized tenderness on palpation and pain exacerbated by movement or deep breathing. Respiratory causes such as pleuritis or early-stage pneumonia may also refer discomfort to the anterior chest wall, though they are typically accompanied by cough, fever, or dyspnea.

Less common but critical considerations include mediastinitis (particularly following recent thoracic surgery or instrumentation), aortic dissection—which often presents with sudden, tearing pain radiating to the back—and pericarditis, which may cause sharp, positional pain worsened by lying flat and improved by sitting forward.

Any new, persistent, or worsening substernal discomfort—especially when associated with diaphoresis, nausea, dyspnea, syncope, or radiation to the jaw, arm, or back—requires immediate medical assessment. Diagnostic workup may include electrocardiography, cardiac biomarkers, upper endoscopy, esophageal manometry, or cross-sectional imaging, depending on clinical suspicion. Early recognition and appropriate triage are essential to differentiate life-threatening conditions from benign ones.