Mick Hucknall's thyroid condition went undiagnosed for a decade because he mistook the symptoms for old age.
The Simply Red star went public with his hypothyroidism diagnosis in February, 2013, and has now revealed he spent 10 years suffering symptoms such as crippling tiredness, aching joints and weight gain before doctors finally realised what was wrong.
He tells Britain's Daily Mirror newspaper, "I'm not fully recovered yet but it's not as bad as it was. It was undiagnosed for years and the specialist I saw told me I'd probably had it since 1993. I had no idea. I knew I had aching joints and was tired all the time and had weight gain. But I thought it was simply growing old... I had mood swings, aching joints, fatigue, lots of connecting things with that."
After his diagnosis, the British pop star decided to shun medication and instead treat his condition using diet changes and an overhaul of his lifestyle.
He adds, "I decided to recover very slowly by not taking the prescribed medication and doing it through diet alone. In addition to caffeine, I had to cut out cruciferous vegetables... and eat more fish. I also had to get more selenium in my diet and take various vitamin and mineral supplements. Maybe I'm being irresponsible but I always get nervous about going down the drug road now... The specialist just gave me the options. Medication would have got rid of it in about three months or I could change my diet and lifestyle. I would say I'm about 80 to 90 per cent recovered, but I still get these little glandular lumps on my neck now and then. But it is much, much improved. I feel in great shape."
The singer recently announced his band Simply Red is reuniting for a world tour next year (15).