Overview

Angina pectoris describes episodes of chest discomfort that occur when the heart muscle does not receive enough oxygen-rich blood. The pain or pressure typically arises from reduced coronary blood flow and is a clinical sign of underlying cardiac disease rather than a single illness. The term refers to the organ involved — the heart — and the underlying mechanism, commonly related to ischaemia.

Causes and mechanism

The most frequent cause is narrowing of the coronary arteries by atherosclerosis, which limits blood supply during increased demand. Other contributors include coronary artery spasm, blood clots, severe anaemia, or conditions that raise cardiac workload such as fever, rapid heart rate, or high blood pressure. Reduced oxygen delivery or increased oxygen demand leads to biochemical changes in heart muscle that produce pain.

Symptoms and diagnosis

Typical angina produces central chest tightness, pressure or squeezing that may radiate to the neck, jaw, shoulder or arm. Episodes are often triggered by exertion, emotional stress, or cold and usually subside with rest or nitroglycerin. Atypical symptoms can include breathlessness, nausea, or fatigue.

  • Common diagnostic approaches include resting and exercise electrocardiography, ambulatory ECG monitoring, cardiac imaging, stress testing, and coronary angiography.
  • Clinical history and risk factors help distinguish stable from unstable presentations that need urgent evaluation.

Management and prevention

Treatment aims to relieve symptoms, prevent progression to heart attack, and reduce long-term risk. Lifestyle changes (smoking cessation, diet, exercise, weight control) are foundational. Medication options often used include:

  • Nitrates for rapid relief of attacks
  • Beta-blockers and calcium channel blockers to reduce workload
  • Antiplatelet agents and statins to modify disease progression

In selected patients, procedures such as percutaneous coronary intervention or coronary bypass surgery restore blood flow when significant blockages are present.

Prognosis and important distinctions

Stable angina can often be managed effectively but signals an increased risk of acute coronary syndromes. Unstable angina and chest pain at rest are medical emergencies because they may precede myocardial infarction. Prompt assessment differentiates transient, exertional angina from heart attack, which involves persistent injury to the heart muscle.

Notable facts

Angina is a symptom complex rather than a diagnosis in itself. Recognition, timely investigation, and treating underlying coronary disease reduce symptoms and improve outcomes. For more general background read authoritative clinical resources or consult a healthcare professional.