Everyone experiences unwanted thoughts from time to time.

But how does it feel to be trapped in a constant cycle of intrusive thoughts and repetitive behaviours?

This is the reality of life for many people with obsessive compulsive disorder, a common - but commonly misunderstood - mental health condition.

So today we’re dedicating the programme to understanding OCD and how it’s treated.

We’ll visit Britain’s only inpatient unit, Seacole Ward at Springfield Hospital in London, where we’ll meet Albert and Emily who explain what it’s like when life is governed by OCD, and consultant psychiatrist Dr Ilenia Pampaloni who likens intensive treatment to "bootcamp" where patients must face their worst fears 24 hours a day.

We're also joined in the studio by Dr Bruce Clark, consultant child and adolescent psychiatrist at the Maudsley Hospital in London, to tackle some ingrained OCD stereotypes and dissect the common phrase, "I'm a bit OCD".

Bruce offers advice on how to spot early signs of OCD and what we should do if we’re worried - and explains how he stays hopeful because the condition is so treatable.

Presenter: Claudia Hammond

Details of organisations offering information and support with obsessive-compulsive disorder are available at bbc.co.uk/actionline