JLS star Oritse Williams says becoming a celebrity has made it harder to care for his mother, who has multiple sclerosis.

“I’m constantly calling nurses and carers to find out how mum is,” he says.

He says there is barely time “just to have a simple conversation on the phone”.

He says it is very different from when he was 11 and his mother’s main carer.

“I was with my mum every single day,” he says. “I knew what was happening because I was in control of it.”

“It went from my mum being able to walk me to school every single day, to me having to hold onto her to help her to walk,” he says.

“I was helping her bathe and go to the bathroom.”

To hear the documentary BBC Radio 1 made on the subject, follow this link: http://www.bbc.co.uk/radio/player/b01n4hzh

For the full article, see the BBC Newsbeat website: http://www.bbc.co.uk/newsbeat/19707258