Confusion/disorientation
Difficulty breathing/shortness of breath—especially after a long period of inactivity
Excessive sweating or ashen color
Nausea or dizziness
Pain spreading to the jaw, left arm or back (signs of heart attack)
Pain that radiates to your back
Sudden feeling of pressure, squeezing, tightness or crushing under the breastbone
Very low blood pressure or very low heart rate
Very rapid heartbeat and/or breathing
(Aroesty & Kannam, 2020. Mayo Clinic, 2020).