The 38-year-old MP said the news came as “an enormous shock”, but his prognosis was “very good”.
Frontbench Labour MP Wes Streeting has been diagnosed with kidney cancer.
The 38-year-old Ilford North MP – who was promoted last week to shadow child poverty secretary – said the news came as “an enormous shock”.
But he said the cancer had been “caught early” and his prognosis was “very good”, adding he would take time off work until he made “a full recovery”.
Labour leader Sir Keir Starmer said the “thoughts of the entire Labour Party” were with Mr Streeting and his family.
Mr Streeting became a Labour MP in 2015 and is viewed as a rising star in the party.
Before joining the ranks in Westminster, he was the president of the National Union of Students and later led on education for LGBT+ charity Stonewall, tackling homophobia in schools.
He was then elected as a councillor on Redbridge Borough Council in London, becoming the local authority’s deputy leader before making his move to Parliament.
Posting a video on his Twitter feed, Mr Streeting said he discovered the diagnosis after going into hospital for a kidney stone in March.
“At the time, a scan identified a lump on the same kidney,” he said.
“Around a month later, in April, unfortunately that lump was diagnosed as kidney cancer.”
The MP added: “While receiving a cancer diagnosis at the age of 38 has come as an enormous shock, the good news is because of that kidney stone the cancer has been caught early, my prognosis is very good, and I should make a full recovery.
“But it does mean I have to take time off work for treatment.”
Mr Streeting thanked his family, friends and colleagues for their support, as well as Labour candidates and activists who he joined during last week’s election campaign.
“Without knowing it, they made such a difference to me during what was a really difficult time, taking my mind off things and helping me to crack on as normal,” he added.
The MP’s team will carry out his constituency work while he “follows doctors’ orders”.
He added: “My family have made it very clear – and actually so has Keir – that I will not be coming back until I’ve made a full recovery.
“Hopefully that won’t be too long, but in the meantime, bear with me and thank you very much in advance for your support.”
Politicians from across Westminster have wished Mr Streeting well in his recovery.
Sir Keir released a statement, saying: “The thoughts of the entire Labour Party are with Wes and his family at this very difficult time.
“Wes is a friend and a colleague and I know he will come back from this even stronger and more determined than ever before.
“I cannot wait to see him back in Parliament as soon as possible.”
Deputy Labour leader Angela Rayner also tweeted to send her “love and solidarity”, while shadow education secretary, Kate Green, said: “Sending loads of love and good wishes to my wonderful, optimistic, brave and all round amazing friend and colleague.”
Former Conservative Chancellor George Osborne tweeted “everyone wishes you the very best and knows you will come back even stronger”, while Tory MP Nus Ghani wished him “a swift recovery”.
The SNP’s Stewart McDonald also sent his “best wishes”, while Liberal Democrat MP Wera Hobhouse tweeted: “I am thinking of you and wish you and your family all the strength you need.”
And Mr Streeting’s Labour colleague, Stella Creasy, added: “Cancer doesn’t know who its dealing with – we are all rooting for your speedy recovery!”.