Tom and his family were enjoying a break in Norwich over the summer, however he suffered weeks of unexplained seizures and eventually got a test.
Doctors broke the news that he had a tumour that was known as a grade four glioblastoma, saying it was “the worst case scenario”.
And in an upsetting blow, life expectancy for someone suffering with the diagnosis is between just three to 18 months.
He explained: “I knew something wasn’t right, but I never expected it to be this. You never think this will happen to you.”
The boyband star broke the news to his social media followers today (Monday) with a difficult message.
It read: “Hey guys, you know that we’ve both been quiet on social media for a few weeks and it’s time to tell you why.
“There’s no easy way to say this but I’ve sadly been diagnosed with a brain tumour and I’m already undergoing treatment.
“We decided, after a lot of thought, that rather than hiding away and trying to keep it a secret, we would do one interview where we could lay out all the details and let everyone know the facts in our own way.”
Tom’s message continued: “We are all absolutely devastated but we are gonna fight this all the way.
“It’s gonna be a tough battle but with everyone’s love and support we are going to beat this.”
For emotional support you can call the Samaritans 24-hour helpline on 116 123, email [email protected], visit a Samaritans branch in person or go to the Samaritans website.