Symptoms most often described by people having a heart attack: Chest pain (angina). This symptom can be mild and feel like discomfort or heaviness, or it can be severe and feel like crushing pain. It may start in your chest and spread (or radiate) to other areas like your left arm (or both arms), shoulder, neck, jaw, back or down toward your waist. Shortness of breath or trouble breathing. Nausea or stomach discomfort. Heart attacks can often be mistaken for indigestion. Heart palpitations. Anxiety or a feeling of “impending doom.” Sweating. Feeling lightheaded, dizzy or passing out.