Nicky Campbell diagnosed with bipolar

Nicky Campbell has been diagnosed with bipolar disorder.

The \'Long Lost Family\' host is set to open up about his "late diagnosis" in a new memoir, which is titled \'One Of The Family\'.

He told the Daily Mirror newspaper: "So many people have been brave enough to tell their stories on \'Long Lost Family\'. I think it\'s my turn."

Publisher Rowena Webb added: "Nicky\'s courage and honesty in writing his story makes this a very special book. And it wouldn\'t have happened without a very special dog called Maxwell. It\'s a book for life. And I can\'t wait for others to read it too."

The book - which is set to be released in February - will focus on the 59-year-old presenter\'s life from his adoption to his mental health.

Nicky was adopted by Sheila and Frank Campbell in April 1961, when he was just a few days old.

His biological mother travelled from Ireland to the UK to give birth to him, and the Radio 5Live presenter was able to track her and his biological father down when he was in his 20s.

He previously said: "It was a surreal moment for me. I met my birth mother in Dublin in 1990 and, for the first time, I saw a face that looked like mine. But I felt no emotional connection with her, no spiritual connection even.

"There was nothing. If anything, I felt quite sorry for her. She\'d had two children within 18 months, by two different men; she led a complicated, rather tragic life. But I\'m so thankful to have met her and felt honoured to help carry her coffin when she died in 2008."