Angina is a type of chest pain that occurs when the heart doesn't get enough oxygen-rich blood. It often feels like pressure, squeezing, or a heavy weight on the chest. This discomfort can also spread to the shoulders, neck, arms, or back. Angina is usually triggered by physical activity, stress, or extreme temperatures, and it often goes away with rest or medication. There are two main types of angina: stable angina and unstable angina. Stable angina is predictable and occurs during exertion, while unstable angina is more unpredictable and can happen at rest. It's important to seek medical attention if you experience angina, as it may indicate a higher risk of heart problems.