The singer said he was somewhere in Australia and away from technology but decided to let his followers know about his condition.
"Just to let all my beautiful fans know, I'm ok. I am insanely relaxed and am somewhere in the middle of Australia with no phone, no laptop and I haven't spoken a word in three days. Trying my absolute best to be back on my feet and singing for next week," Smith wrote and also posted a picture.
"So amazing to have this time to turn off, but it does make me realise how much I love what I do, and how much I miss you all when I'm not on stage. I hope you are all happy and healthy wherever you are. I'm gonna go back to my black and white movies and pretend I'm Judy Garland for a few more days," he wrote.