When you feel anxious, your body releases stress hormones that can cause your muscles, including those in your chest, to tense up. This is a normal part of the fight-or-flight response. While it can be frightening and mimic symptoms of a heart attack, anxiety-related chest tightness is typically harmless. Deep breathing exercises, progressive muscle relaxation, and grounding techniques can help relax these muscles.
If you're concerned about your heart, it's always wise to consult a healthcare provider for peace of mind.