Whenever you hear I'm here, you're filled with dread. When you see me, your heart breaks. Everyone fears me. What am I?
Everyone has experienced this at least once.
I think it is:
a dead family member
Explanation:
all people are 'filled with dread' when they hear they a loved one has passed.
when you see a dead body you feel sad, or your 'heart breaks'.
all people fear that someone close would pass away.
Everyone has seen a family member die at least once.
OLD ANSWER:
I think it is:
Death
Explanation:
some people are 'filled with dread' when they hear they are going to die.
when you see a dead body you feel sad, or your 'heart breaks'.
most people fear death.
Everyone dies once, which counts as 'at least once'.