6. SWEATING.
Unless you’re going through menopause or have just exercised, breaking out into a cold sweat or perspiring excessively could signal a heart attack. During a heart attack, your nervous system activates a “fight or flight” response that puts you in survival mode and could lead to sweating.

7. HEART PALPITATIONS.
When the heart is lacking adequate blood supply, all sorts of things can happen in the body. According to Stoney Brook Medicine, the heart can begin to get irritable when it lacks nutrient-filled blood, which leads to the sensation of heart palpitations. If you feel like you’re having heart palpitations, make sure you contact your doctor right away.8. SHORTNESS OF BREATH.
Walking up the stairs used to be a breeze, but if you recently have been finding it harder and harder to make the climb, seek medical attention immediately. Even though this doesn’t necessarily mean you’re about to have a heart attack at this moment, it could be a sign that your heart is in danger. According to the AHA, shortness of breath could come with or without any chest pain.