An increasing number of people are questioning their gender identity. Waiting lists for specialist clinics treating both children and adults with gender dysphoria are increasing, with some having to wait years to been seen. Many who transition to a gender different to the one they were assigned at birth live happy lives. But, File on 4 has spoken to some who now regret the taking of cross-sex hormones or undergoing surgery, and who are now detransitioning. They and experts working in the field of gender identity fear that other mental health issues are not being adequately explored before life-changing decisions are made and have told the BBC more help is needed for this vulnerable group. Image credit; Natasaadzic\Getty