Gavin and Stacey star Joanna Page will face her own challenge alongside the Bushtucker Trials when she enters the Australian jungle for I'm A Celebrity... Get Me Out of Here! The show returns to ITV screens this Monday, November 16, and the Swansea-born actress, who also appeared in the festive rom-com Love Actually, will share camp with footballing legend Wayne Rooney, soap star Claire Sweeney and Paralympian Ade Adepitan.

The mum-of-four will have an 'invisible' health issue to manage while away from home. Page has previously spoken about losing her signature energy and suffering bouts of chronic fatigue, and she noticed a tendency to shiver. She is likely to continue managing her underactive thyroid, known as hypothyroidism, which the NHS describes as common and which requires lifelong medication to prevent symptoms returning.S1S2

Page told Wales Online that she constantly felt as though she was 'in slow motion all the time'. "I just had no energy," she said. "I'd get out of bed, load the washing machine, and then be so drained I'd have to sit around staring into space for the rest of the day. I was continually freezing cold." She said she would have the central heating on full blast and wear three layers including thermals, while her husband James walked around in shorts because the house was so hot.S1S2

Symptoms of an underactive thyroid often resemble those of other conditions and usually develop slowly, so they can go unnoticed for years. Because many of its most severe symptoms cannot be seen by others, it is widely described as an 'invisible' condition. People may mistake the signs for the menopause if they are at an age when it might be expected.S1S2

Treatment involves taking daily hormone replacement tablets called levothyroxine to raise thyroxine levels. Regular blood tests are carried out until the correct dose is reached, and then usually once a year to monitor hormone levels. People generally need treatment for the rest of their life, but are often able to lead a normal, healthy life.S1S2