Linda Nolan is feeling "burned and raw" following cancer treatment, but will fight on in honour of her late sister Bernie.
Former singer and entertainer Nolan, 58, part of 1970s Irish girl group The Nolans, first opened up about her secondary breast cancer diagnosis last month.
Nolan was diagnosed following a fall earlier this year - 10 years after she was initially treated for the illness.
Nolan, whose sister Bernie died of the same illness in 2013, said she is struggling with pain as she receives treatment, and also revealed she can no longer walk without using crutches.
The Mirror quoted her as saying: "You put on a brave face but it's a nightmare. My hip is so painful I can hardly walk."
She reportedly said: "And my skin is burned and raw from radiotherapy.
"It's crazy that something I know should be helping is causing such pain."
She continued: "I've been given a cream and take 17 tablets a day.
"The tiredness is something else - I can't even get through a whole programme on TV, I'm just wiped out.
"But I'm just glad they're giving me treatment."
Nolan said it has been tough to be diagnosed with the disease again, believed to be treatable but not curable.
But she said: "I've got Bernie in my ear the whole time saying, 'You go for it', so I've picked myself up.
"I owe it to her to keep fighting."