We all feel tired from time to time; a busy family and social life, a few late nights, deadlines at work – whatever the reason, tiredness can catch up with all of us at times. But you may have realised that you’re feeling tired all the time, perhaps for no apparent reason, and even tired when you wake up. It’s a common problem. I see lots of clients who are, to some extent, ‘tired for no reason’. ONE of the reasons may be an underactive thyroid. Production of too little thyroid hormone (hypothyroidism) is a common cause of unexplained fatigue; production can be affected by all sorts of things – an autoimmune response, for example, or other factors such as prolonged stress or intake of certain drugs which can damage your thyroid. Thyroid function is assessed via blood tests but often few markers are included, and whether you are found to be inside or outside the normal range can depend on where the test is carried out.