Get/have itchy feet
Definition 1 of 1
Pro Tip 1/3Metaphorical Meaning
The phrase doesn't mean actual itchy feet, but a longing for change or adventure. 
Seeing her friends' travel photos gave her itchy feet.
Pro Tip 2/3Informal Usage
The phrase is casual and typically used in informal conversations or writing. 
I've had itchy feet ever since I graduated; I just want to explore the world.
Pro Tip 3/3Not Literal
Remember, it's an idiom. Don't use it when you actually mean someone's feet itch. 
Every spring, I get itchy feet to start gardening, not because my feet are itchy!