Once, only models were determined to make sure that their legs didn't touch. Now it has become a widespread, harmful – and often unachievable – obsession
Pete Etchells: On the one hand, anxiety is a serious and debilitating disorder. On the other, it can be a useful evolutionary response to threat. Understanding how anxiety works might help to destigmatise mental health issues
Richard Vine: Prince William has admitted that the sounds of African animals help him chill out. But not all creatures have the same effect on everyone. So what would your choice be?
Tom Riddington: Suicide rates are on the rise, due to the recession and an increasingly divided society – which means it is a dangerous time for NHS mental health services to to be so badly underfunded
John Crace: For years cartoonist Ellen Forney struggled to find effective treatment for her condition. Now she has created Marbles: Mania, Depression, Michelangelo & Me, a deeply personal hand-drawn book that details her experiences
You mentally undress your friends, Tony Blair, the lollipop lady. Your thoughts are X-rated. You wonder if you're a paedophile – or just losing your mind. Rose Bretécher describes the nightmare – and dark comedy – of living with pure OCD