Ant McPartlin has arthritis in his thumb.
The 38-year-old TV presenter - one half of Ant and Dec - has developed the medical condition, which causes inflammation in the joints, just months after accidentally slicing off part of his thumb with a vegetable slicer in February.
Describing his injury as a "nasty old thing to see", he added to The Sun newspaper: "I know that I'm going to sound like a nan, but I've got to keep it out of the rain. The rain messes with it and it gets really stiff. I've got arthritis. I can't go giving thumbs up willy-nilly."
The Geordie star, who scooped up two BAFTAs with Declan Donnelly at the British Academy Television Awards on Sunday (18.05.14), also spoke for the first time about his attack at the hands of a group of young hooligans in March.
Ant and his mum were left shaken up after he asked the yobs to stop filming him on camera-phones as they enjoyed a quiet meal at a pub in Chiswick, West London.
He told the Daily Mirror newspaper: "It's not going to stop me going out for a pint. These sort of things happen once in a blue moon."

Helena Bonham Carter will play her step-great grandmother in 'The Guns of August'. The 47-year-old actress has been cast as Margot Asquith in the drama which follows the missed opportunities and aristocratic follies of the summer of 1914 beginning pri...

Angelina Jolie found it difficult being mean to daughter Vivienne in 'Maleficent'.
The 38-year-old actress who plays the titular villain in the re-imagining of Walt Disney's 1959 'Sleeping Beauty' worked opposite her adorable five-year-old daughter who was cast as the young Princess Aurora and although she had to say horrible things to the tiny tot she was glad to have her lovingly staring back at her.
Talking on 'Good Morning Britain', she said: "It's not easy. I actually had to say to her things like 'I don't like children, go away'. When you say that to your own kids in the big devil horns, in the staff... But, fortunately, because she's my kid, that's why we cast her, other kids were scared of me. I could say anything and look as scary as they come and she'd just smile at me like 'I don't care, I love you'."
Despite Vivienne being in the film Jolie - who also raises Maddox, 12, Pax, 10, Zahara, nine, Shiloh, seven, and twins Knox with fiance Brad Pitt - admitted they didn't want any of their six children to become movie stars.
She told Mail Online: "Neither one of us want our children to be actors, Brad and I but it was just I really couldn't ask another four/ five year old to do it because kids on set did actually get scared and they would cry when they would see me."

Vin Diesel struggled to work following Paul Walker's death.
The 46-year-actor found it "challenging" to return to the set of his new movie 'Guardians of the Galaxy' following his 'Fast and Furious' co-star's death last November.
Diesel put his energy into his work and focussed on his portrayal of Groot, who he lends his voice to in the sci-fi-adventure, and found this "therapeutic".
During a Facebook Q&A on Monday (19.05.14), he said: "It was very personal- it was the month after the accident happened with my brother Paul Walker and it was the first time I had worked since.
"Although it was challenging, just to get back to work was therapeutic- especially as Groot. There was an innocence about the character that was just refreshing- and it may have been more challenging under other circumstances, but at that time, it was very therapeutic."
Walker - who starred alongside Vin for over a decade in the 'Fast and Furious' movie franchise - died along with his friend Roger Rodas on November 30 after the Porsche Carrera GT they were travelling in crashed into a tree and burst into flames in California.
The coroner listed speed as the lone reason for the fatal crash after investigators found no sign of mechanical fault.

Michael Jackson is set to tour the world again - as a hologram.
The late King of Pop, who was resurrected onstage at the Billboard Music Awards on Sunday night (18.05.14) thanks to advanced technology, could wow fans across the globe again five years after his death.
The producers behind the special effects extravaganza want to take their show on the road for a two-year tour and are predicted to make half a billion dollars.
A source told the Daily Star newspaper: "It's only a matter of time before a hologram like this goes on tour. Public appetite for Michael Jackson's music has never been greater and this is a unique way of experiencing his magic."
The hologram performance at the Billboard Music Awards follows the success of a new posthumous Michael Jackson album, 'Xscape', which recently topped the charts in the UK.
John Branca, the executor of the singer's estate, added: "It's so important to experience Michael Jackson in a live setting. We wanted a live performance in front of a live audience."
It took four months to put together the lavish special effects show, which saw Michael's hologram gyrate and moonwalk on stage to new song 'Slave to the Rhythm'.
The late singer's choreographers, Rich and Tone Talauega, were behind the dance moves.

Nicki Minaj went through a lot of emotions when recording her new track 'Pills N Portions'.
The 'Starships' hitmaker, who releases her new song tomorrow (21.05.14), taken from her latest album 'The Pink Print', experienced a lot of different feelings in the studio.
She said: "It sounds like urgency, it sounds like betrayal, it sounds like running, it sounds like fainting, it sounds like love, it sounds like ahhh.
"It feels very uplifting and it feels very soulful. It's a great indicator of what 'The Pink Print' will feel like in terms of the storyline of that song.
"'The Pink Print' will remind people why they fell in love with Nicki Minaj and I think that needs to be done."
The singer and actress is "very excited" about the new record and claims she turned down a lot of features this year because she wanted to focus on her solo material.
The 31-year-old superstar, who was born in Trinidad, has also promised fans she's going back to her hip-hop roots with her new album, the follow-up to 2012's successful 'Pink Friday: Roman Reloaded'.
She added to radio station Power 106: "I think I kind of start from scratch, almost re-introduce myself again.
"I know people know me. I wanted to remind them of where I came from."

Sir Paul McCartney has been forced to cancel his Japanese tour due to illness.
The former Beatle is believed to have contracted a virus and has scrapped the two remaining dates on his 'Out There Japan Tour 2014' - a gig at the Nippon Budokan hall in Tokyo, where the band first during their first Japan tour in 1966, and a concert at Yanmar Stadium in Osaka.
A message on the 71-year-old star's website states that doctors have ordered him to have a "complete rest".
Promoters Kyodo Tokyo said in a statement that Paul "will regrettably have to cancel the remaining Japanese shows. Paul is still not feeling better and this cancellation is unavoidable".
The star is reportedly "upset" about the situation as "he has only ever had to reschedule a handful of shows in his entire career" and hates disappointing fans.
A statement from Paul on his website reads: "Thank you so much for your kind messages of support.
"I'm so very touched. Unfortunately my condition has not improved overnight. I was really hoping that I'd be feeling better today. I'm so disappointed and sorry to be letting my fans down."
The singer is still scheduled to perform a concert in Seoul, South Korea, on May 28, followed by 19 performances in America.

Prince Harry visited the Colosseum in Italy yesterday (19.05.14).
The flame-haired royal surprised a group of American and Canadian tourists at the historical landmark as he joined them for a guided tour before ending his two-day visit to Rome.
Harry's guide explained the history of the famous building - which was built between 70 and 80 AD and hosted gladiatorial combats, animal hunts and shows for the Roman emperors - to his royal client.
The Prince received a welcome similar to that of a Roman ruler himself as his appearance at the Colosseum prompted cheers from eager-eyed travellers who spotted him from the higher galleries of the ancient stadium.
Speaking about their encounter with Harry, The Quenneville family from Canada told ITV News: "It was the highlight of our visit. It was crazy. It was unbelievable. Better than the Colosseum."
Following his visit to the iconic building Harry stopped off at a number of other tourist spots including the Trevi Fountain, the Pantheon and Aventine Hill before making his way to the airport.
The 29-year-old Prince was in the capital city to attend a commemorative service for fallen and veteran soldiers from New Zealand who fought in the World War II battle at Monte Cassino.

Natasha Hamilton is having a baby girl.
The former Atomic Kitten singer - who already has sons, Josh, 11, with nightclub owner Fran Cosgrave, Harry, 9, with dancer Gavin Hatcher and Alfie, 3, with ex-husband Riad Erraji - has revealed she is expecting a baby girl with '5ive's' Ritchie Neville.
She said: "We did it ... we made a girl!
"Little girls have been so on my radar, I see them with pigtails and frilly socks with their mums and I still can't believe I'm having a mini-me!"
The 'Whole Again' singer, 31 - who became romantically involved with Ritchie during the filming of ITV's reality show 'The Big Reunion' last year - even hinted that an engagement may soon be on the cards for the pair.
Speaking in the new issue of OK! magazine, she said: "I'm just waiting for the wedding ring now, to be honest."
Ritchie, 34, also spoke about his excitement at hearing the news but confessed he's worried about becoming an over-protective father.
He said: "I was shell-shocked and like, 'Oh s**t, I'm going to have to be a protective dad. What if she brings and idiot back when she's 18?'
"A boy was going to be a lot easier - what am I meant to do with a girl?"
Natasha - who announced her pregnancy just last month - has also revealed she suffers from a severe anxiety disorder which was recently exacerbated when she feared she had gone into premature labour.
She said: "I was in so much pain, my belly was tightening. It was frightening - water infections can trigger premature labour - but luckily I caught it just in time."

Kim Kardashian and Kanye West are treating their wedding guests to a private tour of the Palace of Versailles.
The couple - who were refused permission to marry at the Paris landmark - will be joined by friends and family members to visit such sights as the Hall of Mirrors, the King's Grand Apartments and formal gardens with fountains and water attractions on Friday (23.05.14), the day before they tie the knot.
An official statement from the couple and officials at the palace said: "Kim Kardashian and Kanye West have decided to let their guests discover the Château of Versailles during a private surprise tour on Friday, May 23, the eve of their wedding."
Before the tour, fashion designer Valentino Garavani will host a brunch for the couple and a few friends and family members at his 17th-century Château de Wideville, which is situated just outside Paris.
According to the New York Post newspaper, the wedding guests will then be flown via private jet to Florence, Italy, for the big day on Saturday (24.05.14), which will take place at Fort Belvedere.
Everyone attending the nuptials will receive special mobile phones, as their regular handsets will be taken away, and personal security.
Meanwhile, 'Video Games' hitmaker Lana Del Rey - who turned down a request to perform at Kanye's lavish proposal last October - has reportedly agreed a six-figure pay deal to perform Kim's favourite song ' Young and Beautiful' at the wedding.
A source told the Daily Mirror newspaper: "Kanye knew how much Kim loved Lana's music, which is why he tried to get her to perform at the proposal.
"So he upped the offer to perform at the wedding and told Lana that it's his and Kim's special song and it would mean so much to have her perform it. She couldn't say no."
The wedding is not being filmed for Kim's reality show 'Keeping Up with the Kardashians', and though the Friday brunch is expected to be covered on Vogue's website, the magazine will not carry any of the wedding pictures.

Ciara has given birth to a baby boy.
The 'Goodies' hitmaker and her fiancé Future welcomed a son into the world "very early" on Monday (19.05.14) morning in Los Angeles, the New York Post newspaper's Page Six column reports.
The baby is Ciara's first child, and Future's fourth.
While the tot's name has not yet been revealed, the 28-year-old singer recently admitted she and her fiancé had already selected a moniker for their son.
She explained: "I went with what felt right in my soul and my gut. I didn't second guess it."
The 'Body Party' star also admitted her pregnancy has been "very easy".
She said: "I didn't even know what to expect [with the pregnancy], but it's been a very easy process. And it's been so much fun. Honestly, it's been the coolest experience in my life.
"Being able to know that I can do that is such a blessing. I'm literally obsessed with kids, so I'm excited about being able to have my own to obsess over."
The blonde beauty has been getting mothering tips from her friend Kim Kardashian, who gave birth to her daughter North last June, and she's found their conversations useful.
She said: "We [go] over really personal stuff from the woman's side of things. We've had great conversations and it's been really cool."

Cheryl Cole is meeting with film bosses in Cannes.
The 'Promise This' singer - who recently agreed a deal to return as a judge on the UK version of 'The X Factor' - wants to break into Hollywood so has been trying her luck at the Cannes Film Festival in the south of France, where she hopes to impress big shot producers with her natural charm.
A source told The Sun newspaper: "Cheryl is meeting with studio bosses in Cannes. The festival is the perfect place to meet properly and talk about some of the offers on the table.
"She's considering a career on the big screen, of course, but only if the part is right. She wouldn't go into anything lightly and would make sure she was fully trained and prepped for the job.
"The problem is now that she has another record ready for release and is back on 'The X Factor' as a judge, any film work would have to be after that."
Cheryl is apparently eyeing up a role in an independent film so she can "challenge" herself.
The 30-year-old beauty has been dressing to impress on the red carpet at the star-studded film festival. She donned thousands of pounds worth of jewellery from De Grisogono with a strapless Monique Lhuillier dress to the red carpet of 'Foxcatcher'.
The 'Fight For This Love' star posed for photo opportunities with fellow L'OREAL spokesmodel Eva Longoria.