The 25-year-old, whose 2018 single ‘Someone You Loved’ hit number one, said on the social media platform that his diagnosis ‘makes so much sense’.
He said: “When I look back at my interviews from 2018, I can see that I’m doing it.”
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Capaldi noted that he ‘didn’t want people to think I was taking cocaine or something’, and said that he’d thought he had ‘some horrible degenerative disease’ before being officially diagnosed.
He added: “My shoulder twitches when I am excited, happy, nervous or stressed. It is something I am living with.”
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The musician revealed that he’s been receiving botulinum toxin injections in his shoulder to prevent involuntary twitches and that he can now ‘learn new ways to cope all the time’.
The announcement comes after two sold-out shows at London’s O2 Arena and ahead of Friday’s release of his first single in three years, ‘Forget Me’.
In 2018, American pop sensation Billie Eilish said she had been diagnosed with the condition as a child.
At the time, she wrote: “I’ve never mentioned [Tourette syndrome] on the internet because nobody thinks I’m deada** [serious].
“As well as the fact I’ve just never wanted people to think of Tourette’s every time they think of me.”
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According to People, Eilish opened up in a David Letterman interview earlier this year, saying the condition causes ‘things you would never notice if you’re just having a conversation with me, but for me, they’re very exhausting’.
She added: “So many people have it that you would never know. A couple artists came forward and said, ‘I’ve actually always had Tourette’s.
“That was actually really interesting to me because I was like, ‘You do? What?’”