1. There is a strong feeling of pressure in the chest.

2. Chest pain persists and spreads to both arms, abdomen, between shoulder blades and jaw. There is often a burning sensation in the chest and pain in the neck or upper abdomen.

3. Having difficulty breathing and having to sit or lie down.

4. The face is pale and bloodless, and cold sweat breaks out on the forehead, upper lip and even the entire face.

5. Sudden collapse, but not loss of consciousness. If the above-mentioned pain does not improve within 15 to 30 minutes, you must consult a doctor in time.