Different ways to say not to worry

[BigMak]

What are different ways to say not to worry in English? "Don't worry" and "relax" are the only ones that come to mind.

[herbiji]

hi
I think you can use
take it easy, calm down and you can also use this slang chill out.
I hope I'm right.
waiting for more

[SoothingDave]

"Chillax" is a new one, combining "chill" and "relax." This is slang, of course.

[Raymott]

These mean "Don't get excited":
"Keep your shirt on".
"Don't get your knickers/panties in a knot/twist"

But there's a difference between "Don't worry!" and "Relax!" For example, if someone said they were worried about their mother's illness, they wouldn't need to be told to "chill out".