A heart attack can appear suddenly, but symptoms can also begin hours, days, or even weeks beforehand. Some signs are classic, while others can be subtle. Here are 10 warning signs that should not be ignored:

1. Chest discomfort or pressure
   The most common sign is pain, pressure, squeezing, heaviness, or tightness in the center or left side of the chest. It may last several minutes or come and go.
2. Pain spreading to other areas
   Pain may move to the arm (often the left arm but sometimes both), shoulders, neck, jaw, back, or upper stomach.
3. Shortness of breath
   Feeling unusually breathless can happen with or without chest pain.
4. Cold sweat
   Sudden sweating without obvious reason, especially clammy or cold sweat.
5. Nausea or vomiting
   Some people—especially women—may feel sick to their stomach.
6. Unusual fatigue
   Extreme tiredness that seems out of proportion to activity, especially if it is new or unexplained.
7. Dizziness or lightheadedness
   Feeling faint, weak, or as if you might pass out.
8. Indigestion-like discomfort
   Burning, pressure, bloating, or pain that feels like severe heartburn.
9. Rapid or irregular heartbeat
   A racing, pounding, or fluttering feeling in the chest.
10. A feeling that something is seriously wrong
    Some people describe an unexplained sense of doom or intense uneasiness before a heart attack.

Important notes:

• Symptoms can differ between men and women. Women more often report nausea, fatigue, back pain, or shortness of breath.
• Older adults and people with Type 2 Diabetes may have milder or unusual symptoms.

If someone has chest pressure lasting more than a few minutes, severe shortness of breath, fainting, or symptoms strongly suggesting a heart attack, seek emergency medical help immediately. Early treatment can save heart muscle and lives.