Fatigue, weight gain and cold intolerance that get attributed to everything except the thyroid.
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The thyroid sets the pace of your metabolism. When it is underactive, everything slows — energy, digestion, heart rate, thinking, mood.
It affects around 1 in 50 women and 1 in 1,000 men, and it is one of the more commonly missed diagnoses, because every symptom on its own has a dozen other explanations.
TSH is the pituitary's instruction to the thyroid — it rises when the thyroid is underperforming, so it is a sensitive first marker. But on its own it is an incomplete picture, and NHS testing frequently measures nothing else.
A full panel measures TSH, free T4 and free T3 — plus thyroid antibodies.
Anti-TPO and anti-Tg antibodies identify Hashimoto's, the autoimmune cause behind most UK hypothyroidism.
Their presence changes what a borderline result means. A mildly raised TSH with positive antibodies is likely to progress and warrants monitoring or treatment; the same TSH with negative antibodies frequently settles on its own.
That distinction is why "your thyroid is fine" from a TSH alone is not always the end of the question.
A raised TSH with normal T4 — common, and genuinely debatable. Treatment depends on how high the TSH is, whether antibodies are present, whether you have symptoms, and whether you are pregnant or planning to be.
In pregnancy the threshold is lower and the urgency higher, because untreated hypothyroidism affects the developing baby.
Biotin supplements distort thyroid assays convincingly — producing results that can look like thyroid disease when there is none. Stop biotin 48 hours before testing.
Acute illness also alters thyroid results, so testing during or just after a significant illness is worth repeating later.
Coeliac disease, B12 deficiency and other autoimmune conditions cluster with Hashimoto's, and are worth checking rather than assuming.
A full thyroid panel measures TSH, free T4 and free T3 alongside thyroid antibodies — and the antibodies matter, because they identify Hashimoto's and predict whether borderline results will progress.
NHS testing often measures TSH alone, which is why people are told their thyroid is "fine" while a fuller picture would show otherwise.
Where treatment is indicated, levothyroxine is straightforward, taken once daily, and dose is guided by repeat testing at six to eight weeks. Coeliac disease and B12 deficiency both cluster with Hashimoto's and are worth checking.
Severe untreated hypothyroidism can very rarely cause myxoedema coma — profound drowsiness, confusion and low body temperature. That is a medical emergency requiring 999.
Otherwise, hypothyroidism is managed at a normal pace. Chest pain or palpitations after starting levothyroxine should be reported promptly.
This matters more than most people are told, because absorption is easily disrupted.
Different manufacturers' levothyroxine is not always identical in effect. If you are stable and your pharmacy switches brand, and you then feel worse, that is worth raising rather than dismissing.
Improvement is gradual — weeks rather than days, and blood tests are repeated at six to eight weeks after any dose change because levels take that long to settle.
Testing sooner than six weeks gives a misleading result and leads to unnecessary dose changes.
Thyroid testing and levothyroxine are both available on the NHS, and people with hypothyroidism qualify for a medical exemption certificate making all their prescriptions free. That is under-claimed and worth applying for.
Levothyroxine is one of the cheapest drugs in the formulary, and NHS treatment is free — in fact, an underactive thyroid entitles you to free NHS prescriptions for everything in England via a medical exemption certificate, which many people do not know to claim.
That alone is worth more than most private consultations.
Where a private consultation genuinely helps is the person who feels unwell despite a normal TSH, which is a common and frustrating situation. That deserves a proper conversation rather than a repeated blood test — including whether something else is responsible: iron deficiency, B12 deficiency, coeliac disease, sleep apnoea or depression all produce identical symptoms.
What we will be honest about: private clinics selling T3, desiccated thyroid extract, or treatment based on symptoms with normal blood tests are practising outside UK guidance. The evidence does not support routine T3, it is not licensed for this in the UK in the way people assume, and unregulated thyroid extract carries genuine cardiac and bone risks. We will not prescribe them.
Practical points that cost nothing: take levothyroxine on an empty stomach, separated from iron, calcium, indigestion remedies and coffee by at least four hours — all of which block absorption and are a very common reason a stable dose stops working.
NICE NG145, Thyroid disease: assessment and management, is the governing guideline. It recommends levothyroxine as first-line treatment for primary hypothyroidism, with dose titration guided by TSH.
NG145 recommends against routinely offering liothyronine (T3), either alone or in combination, citing insufficient evidence of benefit and uncertainty about long-term safety — the basis for the position above.
NG145 covers subclinical hypothyroidism, recommending consideration of treatment where TSH is above 10 mIU/L on two occasions, and a six-month trial in younger people with lower elevations and symptoms.
NG145 recommends annual monitoring of TSH once stable.
British Thyroid Association guidance addresses the absorption interactions listed above, and advises against unlicensed desiccated thyroid extract, whose hormone content is variable and unregulated.
Ask what was actually measured. A TSH alone is not a full thyroid assessment.
Free T4, free T3 and antibodies add real information — particularly antibodies, which tell you whether a borderline result is likely to progress.
It is also worth checking ferritin and B12, which produce the same symptoms and travel with thyroid disease.
A raised TSH with a normal T4. Whether to treat is a genuine judgement rather than a rule.
Positive antibodies, symptoms, a TSH above 10, or pregnancy all push towards treating. A mildly raised TSH with none of those often settles by itself.
Usually yes, where the cause is Hashimoto's. It is replacement of something your body has stopped making rather than a drug in the usual sense.
It is also free — hypothyroidism qualifies you for a medical exemption certificate covering all your prescriptions.
Several possibilities, and they are worth working through rather than accepting.
The dose may need adjusting. Absorption may be affected by coffee, iron or calcium taken too close to it. Ferritin, B12 and vitamin D are frequently low alongside and cause the same fatigue.
And sleep apnoea and depression both coexist with thyroid disease and are commonly missed once a thyroid label exists.
A small minority of people do not feel well on levothyroxine alone, and combination treatment is used in specialist practice.
It is an endocrinology decision, not a routine one, and unregulated T3 bought online carries real cardiac and bone risks.
Correcting hypothyroidism usually loses a few pounds of retained fluid, not more.
It is not a weight-loss drug, and taking more than you need to lose weight causes heart rhythm problems and bone loss.
Only if you have coeliac disease — which is commoner in Hashimoto's and worth testing for.
Test before removing gluten, because the test becomes unreliable once you have stopped eating it.
Yes, considerably. Requirements rise in pregnancy, thresholds are lower, and untreated hypothyroidism affects the baby.
Tell whoever manages your thyroid as soon as you are pregnant or planning — the dose usually needs increasing early.
August 23, 2026
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Same-day access is usually available, from 6am to 10pm, seven days a week. You choose a time that suits you rather than waiting on hold at 8am.
Yes. Care is led personally by Dr Mohammad Khan, so you are not passed between clinicians. Continuity is the point of a small practice: someone who knows your history and is listening attentively rather than working through a checklist.
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Twenty unhurried minutes and a comprehensive assessment. A written treatment plan is included, along with any prescription, sick note or referral letter arising from the consultation, at no extra charge.
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It means the diagnosis can usually be made from your history and photographs, and that treatment can be arranged safely without examining you. Where a condition is not marked treatable online, it is because examination is the diagnosis — listening to a chest, feeling an abdomen, examining an ear or a joint — or because a procedure or device is needed.
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If your problem turns out to be genuinely outside what we can do remotely, the doctor will tell you straight away, point you to the right service, and refund your fee in full. We would rather do that than fill twenty minutes to justify the charge.
Call 999 or go to A&E — do not book an online appointment and do not wait for a reply to an email. For urgent problems that are not emergencies, NHS 111 is available 24 hours a day, online or by phone, and can direct you to the right service.
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