Angina is a type of chest pain or discomfort that occurs when the heart muscle doesn’t get enough oxygen-rich blood. It’s usually caused by narrowed or blocked coronary arteries, which are the blood vessels that supply the heart muscle with oxygen and nutrients. Angina can be triggered by physical activity, emotional stress, or even extreme temperatures. The pain may feel like pressure or a squeezing sensation in the chest, but it can also spread to the arms, neck, jaw, shoulders, or back. Other symptoms may include shortness of breath, sweating, nausea, or dizziness. Angina can be a warning sign of a heart attack and should be evaluated by a medical professional.