The Voice mentor Jessie J is being monitored by doctors as she takes part on the show over fears the stress and high-pressure could affect her health, according to reports.
The Domino singer who suffered a stroke when she was eighteen, is said to have caused concern among friends and family over her increased workload and hectic schedule.
Speaking to the Daily Star newspaper a source said: "Jessie has a history of medical issues and needs to be monitored. She works incredibly hard not only on The Voice but also promoting her album around the world.
"Add that to the gruelling touring, personal appearances and recording, and it would be a lot for anyone to take. It's not something Jessie really talks about but she still has health check-ups on her condition."
Speaking about her illness in the past, the newspaper quote the Price Tag singer as saying: "I had a stroke when I was 18. I was in a girl band at the time and had, like, four jobs. I was really tired and my body shut down."
"It made me realise that no matter how much you take care of yourself - I don't drink, smoke or do drugs - you can always have your life taken away. I thought I wasn't able to perform again and that experience taught me that you can't take anything for granted."