Loneliness, or feeling that you have no one you can really talk to, affects most people at some point and is associated with poorer physical and mental well-being.

Now BBC Radio 4's All in the Mind have launched the BBC Loneliness Experiment, an online survey to increase understanding of a major issue facing society today.

Presenter Claudia Hammond says they want everyone to take part, whether or not they feel lonely at the moment.

(Animation by Rabia Ali.)