Like my current kitchen renovation.
This is great when it comes to writing stories. If a book idea is jabbing at me, I'll let it simmer in my brain for a while. If the idea won't stop pestering me, I'll start research and then writing.
Another itch I often get involves travel. Truthfully, I can hardly finish one vacation before planning the next. It's an expensive sickness.
What itch do you like to scratch?