Washington, Oct 10: Pop icon Kylie Minogue's sister Dannii Minogue has revealed that she was stricken by a thyroid illness which left her too weak to hold her baby son.

The 39-year-old star, who has a 15-month-old son, Ethan with partner Kris Smith, is still recovering from a thyroid problem which made her loose too much weight and drained her of her energy.

"My thyroid stopped working and I had appendicitis," Contactmusic quoted the 'Australia's Got Talent' judge as telling Stella magazine.

"Leading up to that, I was getting thinner and thinner and stressing because I didn't know what it was."

"Normally you put on weight if you have an under-active thyroid but there is a percentage of people that have it reversed."

"It got very hard to concentrate, you can't sleep and I got very weak. I was finding it hard to pick Ethan up and I was thinking, 'I'm a new mum, I know I'm tired but surely it can't be this hard?"

"When you've just had a baby you think it must be normal tiredness but it got to the point where I thought, 'This can't be normal,'" she added. (ANI)