Please choose the correct ending to complete the given sentence: Health: [header] How to stop chest pain [title] Slow your breathing. [step] People with anxiety frequently experience chest pain because of excessively deep, rapid breathing. This can lead to sharp chest pain close to the heart.

Ending1: To reduce the pain, slow down your breathing and do not take huge, gulping breaths. Take moderate breaths, and make each breath last several seconds. Ending2: You'll find that when you slow down, the ache in your chest makes a louder sound. To mitigate your chest pain and increase the effect of the pain, try counting to 11 deep breaths, twice a day for just a few minutes. Ending3: [substeps] If your heart is beating too rapidly, you likely have a sudden heart attack. Heart palpitations are a common symptom of chest pain. Ending4: Heart tightness is a telltale sign of a heart attack. When the chest tightness is present, your heart is no longer beating.

Answer format: ending1/ending2/ending3/ending4