Ed Sheeran's friends and family are convinced he has attention deficit hyperactivity disorder (ADHD).

The chart-topping star has never been diagnosed with the brain disorder, which is marked by an inability to pay attention for concerted periods of time and hyperactivity - but has revealed it was repeatedly suggested to him throughout his childhood.

Ed, who admits to being a ''weird'' child, shared: ''I was never diagnosed but everyone is convinced I have ADHD.''

The 'Castle on the Hill' hitmaker also claimed he hasn't really taken a day off from working on his music since he was 16.

Ed explained that his admirable work ethic is something that stems from his dad John.

He told GQ magazine: ''It comes from my dad thinking I was lazy and wanting to prove a point.''

Meanwhile, Ed recently said that he and Taylor Swift have become two of the most popular artists in the world because they both have the mentality of an underdog.

He said: ''There's an underdog element to it. Taylor was never the popular kid in school. I was never the popular kid in school.

''Then you get to the point when you become the most popular kid in school - and we both take it a bit too far.

''She wants to be the biggest female artist in the world and I want to be the biggest male artist in the world. It also comes from always being told that you can't do something and being like, 'F you. I can.'''

In fact, Ed revealed that his long-term ambition is to outsell Adele and become the most popular artist in the world.

He reflected: ''Adele is the one person who's sold more records than me in the past ten years. She's the only person I need to sell more records than. That's a big f***ing feat because her last album sold 20 million. But if I don't set her as the benchmark then I'm selling myself short.

''I'm not in competition [creatively] because we all sit in our own lanes, but once the creative product is out there is a race to the finish line.''