Please choose the correct ending to complete the given sentence: Health: [header] How to respond to a heart attack [title] Stop what you're doing if you experience chest pain. [step] Pay close attention to your symptoms. People who have had a heart attack describe the pain as discomfort, chest tightness, a squeezing sensation, burning or an uncomfortable pressure or heaviness in the middle of the chest.

Ending1: This chest pain is called " angina. " [substeps] The pain may come and go. Ending2: If you experience more than one heart attack, talk to a medical professional or emergency medical center to find out what you should do. [substeps] Heart pain is a symptom of a variety of other conditions as well. Ending3: [substeps] Heart attacks can create the quick onset of a muscle cramp, or cluster of muscle spasms. Once a muscle cramp leaves a person with a lump in their chest, large blood vessels are released in their abdomen and blood flows downward, essentially rupturing the blood vessels. Ending4: The pain may be in your chest or over your heart; it may be in the shape of a diamond or other minor indentation. You may also feel pain running around your ribcage or other areas of your body that feel tight and don't conform in the middle of the chest.

Answer format: ending1/ending2/ending3/ending4