While OCD is becoming increasingly common (it is thought to affect 12 out of every 1,000 people in the UK), it is important to speak up and get help, as it is a condition which is unlikely to get better on its own.

However, as there is still such a stigma around mental health conditions, many feel unable to do so.

This is why it is so crucial that stars such as Dunham speak up about their own mental health battles, says Dr Harold S. Koplewics, who works with the Child Mind Institute.

Speaking to People, Koplewics said: “Here are these remarkable individuals who give a message that says ‘if you are not ashamed, if you speak up, if you get a diagnosis and if you get treatment, your life can be as full and as productive as anyone’s – if not even more so than some average people.

“One of the things that change people’s minds about this is when we decrease stigma… and now I think it’s time for us to recognise how real, common and treatable these diseases are.”

Lena Dunham’s powerful advice to her younger self on coping with OCD and anxiety