A rare type of brain and spinal cancer has been identified in DJ Michael Bibi.
The dance music producer said it was "moving fast" and he was staying in hospital for treatment.
In an Instagram post on Monday night, he told fans he'd been diagnosed with primary central nervous system (CNS) lymphoma.
"I don't know what lies ahead, I'm tired but I know I am strong and I won't let this beat me," the 32-year-old added.
Michael is one of the British dance scene's most popular DJs, known for his groove style of house music.
He's been on residency at DC10 nightclub in Ibiza and was due to play at the Parklife festival in Manchester and Glastonbury this summer.
The DJ posted the news on Insta alongside a picture of him doing a peace sign with a cannula in his hand.
He wrote, "I'm sorry for the bad news and typing this message doesn't quite seem real.".
For all of you, I'll return stronger. Love Bibi. ".
Solid Grooves, the record label he founded also posted on Insta, saying he'd taken the brand around the world "while maturing and growing into an international superstar".
"The entire team sends our love and support while he recovers, and we hope to have him back with us as soon as possible to make more memories," they added.
Danny Howard, DJ for Dance Party on BBC Radio 1.
Michael's rise has been sharp over the last five years - going from London heavyweight to global superstar is testament to his hard work and talent.
With his Solid Grooves-branded UK warehouse parties and well-liked Ibiza residency, this talented producer and well-respected DJ is inspiring the next wave of ravers.
While his profile has soared, he's always remained humble and the same guy I used to support back in the day on my late-night Radio 1 show when he was breaking through.
Everyone who has ever worked with or been connected to Michael is undoubtedly devastated upon hearing the news.
I know the entire dance community is behind him, so let's all show him our support and be strong for him as he battles through this traumatic time.
Michael received comments from some of the biggest names in dance music, including Skrillex and Jamie Jones, letting him know they were thinking of him.
Dutch DJ Martin Garrix wrote: "You got this bro! sending lots of strength and love. ".
"This is heartbreaking. Can't imagine what you're going through right now. Wishing you a speedy recovery," Belgian DJ Charlotte de Witte said.
Michael runs two of his own music labels, Solid Grooves and SG Raw, and is known for playing lengthy sets.
Earlier this year, he was forced to cancel some performances due to ongoing tinnitus health-related issues.
The DJ then posted a video online in May saying the problems were down to a "more serious" neurological concern.
- Lymphoma of the brain or spinal cord is also known as primary central nervous system (CNS) lymphoma.
- It's a rare type of cancer - around 2 in every 100 brain or spinal cord tumours are lymphomas.
- Primary refers to the lymph tissue of the brain or spinal cord, whereas lymphoma means it began in the lymphatic system.
- The body's lymphatic system consists of a network of tiny tubes and lymph nodes.
Source: Cancer Research UK.
Follow Newsbeat on . Twitter. and . YouTube.
Listen to Newsbeat . live. at 12:45 and 17:45 weekdays - or listen back . here.
