5. Sudden sweating or nausea
Unexpected sweating, even without physical exertion, can indicate heart stress. When oxygen is lacking, your nervous system may release adrenaline, leading to a cold sweat and rapid heartbeat.
Your body may also pull blood from the digestive system, causing nausea or vomiting. While these symptoms are easy to mistake for stomach issues, they become more serious when paired with chest discomfort or breathlessness.
