A gap in your resume is called a sabbatical. You spent a year doing something else that's more important to you because you can afford it. Medical plus some recovery time is a great reason. But just playing around with some new tech, investing in your education, or even spending time on your other interests, work for charity, or see something of the world, are great reasons. Slacking off may not sound great, but many employers are unlikely to care that much about the gap, and if they do, there's always a more interesting way to phrase it.