precipitants of stable angina include cold weather, heavy meals, and emotional stress.

Unstable angina

Unstable angina (UA) (also "crescendo angina"; this is a form of acute coronary syndrome) is defined as angina pectoris that changes or worsens or begins suddenly at rest. Unstable angina is a medical emergency and requires urgent medical treatment from a doctor.

It has at least one of these three

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