What are the symtoms of a heart attack?

I gotta tell my dad some horrible stuff so I know that he is going to have a moment. What are the symtoms of a heart attack and what should I look out for?

Dear jumpinjesi,
If you feel that he will react very strongly to your information tell him when there will be people in another room for emergency purposes.
Heart attack symptoms:
Uncomfortable pressure, fullness, squeezing or pain in the center of the chest lasting more than a few minutes.
Pain spreading to the shoulders, neck or arms. The pain may be mild to intense. It may feel like pressure, tightness, burning, or heavy weight. It may be located in the chest, upper abdomen, neck, jaw, or inside the arms or shoulders.
Chest discomfort with lightheadedness, fainting, sweating, nausea or shortness of breath.
Anxiety, nervousness and/or cold, sweaty skin.
Paleness or pallor.
Increased or irregular heart rate.
Feeling of impending doom.
Please be aware not all of these may occur.
Sue...good luck

I know one is pain in the left side of chest and the left arm.

warn him first that you have shocking news to tell him..that will help prepare his heart

In addition to all of those above don't forget the tingling sensation in your limbs and heart palpitations, and arteries throbbing

people can get a heart attack have no pain.
I was told that by cardiac people who know.
toni