The source article notes that unusual or extreme fatigue is commonly reported, especially among women.
2. Chest Discomfort or Pressure
Chest discomfort is one of the best-known heart attack warning signs, but it is not always sharp pain. It may feel like pressure, tightness, squeezing, heaviness, burning, or fullness in the chest.
The discomfort may come and go. It may become worse with activity and improve with rest. Some people mistake it for indigestion, acid reflux, anxiety, or muscle strain.
Chest symptoms should be taken seriously, especially if they are new, unusual, or happen with sweating, nausea, breathlessness, weakness, or pain spreading to other parts of the body.
Shortness of breath can appear before or during a heart attack. It may happen while climbing stairs, walking, doing simple chores, lying down, or even resting.