Britain's Tourette's Mystery - Scarlett Moffatt Investigates has received four and five star reviews in The Guardian and The Times.
This documentary follows Scarlett as she embarks on an investigation to uncover the potential causes of this medical phenomenon.
Travelling around the country, Scarlett meets some of those who have recently been diagnosed with the condition, the extraordinarily successful Tourette's influencers sharing their tics online, and the psychiatrists treating the epidemic.
Scarlett leaves no stone unturned in her quest for an explanation and finds herself in the middle of a controversial debate about the meteoric rise of Tourette's influencers on social media. It's also an unexpectedly personal journey for Scarlett, as she reflects on the tics that appeared when she was just 12 years old and already having to deal with crippling anxiety.
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You can catch-up on the documentary now on All 4.