The presenter missed his BBC Radio 5 Live Breakfast show this morning after being rushed to Salford Royal Hospital in the middle of the night.
The Long Lost Family’s presenter took to Twitter to update his followers and thank the emergency services.
He wrote: “Good morning from Salford Royal Hospital where I was rushed last night after a kidney stone attack.
“Blimey. Some pain that!”
“Blimey. Some pain that! Amazing care from compassionate professionals.”
Posting a selfie from his hospital bed, the 57-year-old looked tired and grim-faced.
The father-of-four has been busy replying to his fans messages who wished him well.
One tweeted: “Ouch Nicky. Hope you recover soon! Some length to go to to get out of Brexit chat though!”
Nicky replied: “Haha. Stop it. Hurts to laff.”
Replying to fans who sympathised with the agony of kidney stones, he said: “Worst pain ever. I tell ya. Pain relief was excellent.”
Chris Warburton was called in as a late substitute for Nicky and presented this morning’s show alongside Rachel Burden.
Rachel told listeners she had been in touch with her regular co-host and he was recovering well.
BBC Radio 5 Live Breakfast airs every morning from 6 to 9am.