This report sets out growing evidence that being detained under the Mental Health Act 1983 can be detrimental to women and girls’ wellbeing, with little attention paid to their particular needs, including their experience of trauma. This can have devastating consequences for women and girls, as shown by previously unpublished figures on self-inflicted deaths outlined in this report. Women and girls are slightly less likely than men and boys to be detained under the Mental Health Act. In 2016/17, 21,291 women and girls and 22,716 men and boys were detained. However, women and girls are more likely than men and boys to be in mental health hospitals as a result of being detained (rather than being there voluntarily).