More and more people are being inappropriately diagnosed and treated for underactivity of the thyroid gland (known as primary hypothyroidism), warn doctors in an editorial published on bmj.com.
Hypothyroidism is caused by insufficient production of thyroid hormone by the thyroid gland. It affects about three per cent of the population and is usually treated in primary care. Blood tests are essential in confirming the diagnosis of hypothyroidism.
But doctors at the British Thyroid Association are concerned that, in recent years, increasing numbers of patients with and without confirmed thyroid disease have been diagnosed and treated inappropriately with thyroid hormones.
"This is potentially an enormous problem, given that in any one year one in four people in the United Kingdom have their thyroid function checked," they warn.
The Royal College of Physicians recently set out clear guidance for the diagnosis and treatment of primary hypothyroidism in the United Kingdom, so why have these problems arisen, ask the authors?
Hypothyroidism is common and is becoming more prevalent because of increased life expectancy and an ageing population, they explain. Thyroid hormones also affect most organs, so hypothyroidism presents with symptoms that can mimic other conditions. This can lead to an incorrect diagnosis which could expose some patients to the harmful effects of excess thyroid hormones, while other serious conditions may go undiagnosed.