Doctor reveals the one silent sign that can appear days before a heart attack strikes

Orthopnea, the struggle to breathe when lying flat, is an often-overlooked heart attack warning sign affecting 92% of sufferers. This symptom, frequently mistaken for anxiety or acidity, indicates blood backing up into the lungs due to a weakened heart. Cardiologists emphasize that orthopnea is a critical red flag signaling potential heart strain and the need for immediate medical attention.