Billie Eilish has said she is “doing everything I can” to suppress her Tourette syndrome . The singer-songwriter, who was 11 when she was diagnosed with TS, told of how frustrating it can be when others do not understand the condition. TS causes involuntary sudden, repetitive sounds or movements known as tics, which can be triggered by different things including stress, excitement or tiredness, according to the NHS website. Speaking to Amy Poehler on her Good Hang podcast, the 24-year-old singer spoke about living with the condition and said: “I do have Tourette’s and I have vocal tics but, luckily for me and for everyone else, they’re mostly just noises and I can keep them pretty quiet. “I go through phases of words becoming tics, but there’s a thing called suppressing, if you ever heard of it. “When I’m in an interview, I’m doing everything in my power to suppress all of my tics constantly.…