Graves disease and hyperthyroidism: what needs clarifying first

It often starts harmlessly. You are more awake than usual. You get by on less sleep. Your trousers sit looser, even though you are eating more than before.

For a while this almost feels good. Then it tips.

The heart pounds up into your throat at night. Your hands tremble while holding a coffee. You get loud about things that would not normally touch you, and cry about it afterwards. Stairs become hard, even though you have grown thinner. And at some point somebody says the sentence I often hear in my practice: you are simply stressed.

Many people know this pattern. And many only get a blood test months later, one in which the TSH sits close to zero.

Why hyperthyroidism is more urgent than hypothyroidism

Picture an engine running at full throttle in neutral. Not briefly, but for months. It gets hot, it gets loud, and it wears down.

That is exactly what hyperthyroidism is. The body does not have an energy problem, it has a braking problem. And because thyroid hormone docks onto almost every cell, there is hardly an organ that does not run along with it.

The heart beats faster. The bowel works more briskly. Body temperature sits higher. The resting metabolic rate rises, and appetite rises with it. Weight is lost anyway, and not only fat: the body also draws protein out of the muscles. That is why stairs become hard even though the scale shows less.

And then there is bone. Thyroid hormone speeds up bone turnover, but breakdown wins. Over years that costs substance without anything being felt.

There is even a threshold. An individual participant data analysis of six cohorts with 5,458 people showed an annual loss of bone density at the femoral neck of 0.18 percent compared with people with healthy thyroid function. Below a TSH of 0.10 that became 0.59 percent per year.

From the perspective of Clinical Psychoneuroimmunology, one more layer comes in that never appears in the report. Thyroid hormone raises the sensitivity of heart and vessels to adrenaline. The nervous system receives the same signals as in real danger, only without the danger. That feels like a panic attack: racing heart, tightness in the chest, restlessness without a reason, sleep that does not carry.

I often see people in this state being told first that they have an anxiety disorder. Sometimes both are true. But when tremor, weight loss and heat intolerance come with it, a TSH belongs in the blood work before the conversation turns to the psyche. How closely body and mind work together is described in the guide Lifestyle as therapy for mind and body.

The opposite direction, meaning symptoms despite unremarkable values, is a chapter of its own and is covered in Normal values, symptoms anyway and in Functional hypothyroidism.

And now you know why I become impatient about this one thyroid topic.

The warning signs: when hyperthyroidism belongs in medical hands immediately

One question is asked often online and answered rarely: at what point is a racing heart in hyperthyroidism an emergency?

The honest answer is: the number does not decide, the condition does.

Thyroid storm

Thyroid storm is hyperthyroidism running out of control. Rare, but serious. Typical is a combination: fever, signs in the nervous system such as restlessness, confusion or striking drowsiness, a very fast pulse, signs of heart failure and complaints in the gastrointestinal tract.

Triggers are almost always additional stressors: an infection, an operation, an iodine load such as a contrast medium, a birth, or a suddenly interrupted antithyroid drug. That is one of the reasons why these medicines are never changed on your own.

What follows in hospital runs on several tracks: an antithyroid drug, inorganic iodide, a corticosteroid and a selective beta-1 blocker. The analysis of the same Japanese survey by Isozaki and colleagues found a detail that shows how fine-grained this is: mortality was higher under non-selective beta blockers than under other beta blocker types.

Fever and a sore throat while on antithyroid drugs

Antithyroid drugs can in rare cases make the white blood cells collapse, an agranulocytosis. The first warning is usually an infection that looks banal, with fever and a sore throat. A Japanese analysis of 50,385 Graves patients found 50 cases over twenty years, plus five pancytopenias. The median time from the start of treatment to the event was 69 days, with a range from 11 to 233 days. 54 of 55 people affected recovered.

From this follows a simple rule: fever plus a sore throat while on an antithyroid drug means a blood count, the same day.

The eyes and pregnancy

Thyroid eye disease usually develops slowly. But there are situations that must not wait: a sudden worsening of vision, colours that look paler, severe pain behind the eye, or a lid that no longer closes. Then the optic nerve is at stake.

Graves disease in pregnancy needs special care from the start. The target values are different from otherwise. The choice of agent depends on the timing, in the first trimester propylthiouracil is preferred, after that usually thiamazole. And TRAb can cross the placenta and influence the baby's thyroid, which is why the value is measured in pregnancy. The American guideline on thyroid disease in pregnancy and the postpartum devotes whole chapters to this. For you this means: raise it early, not as a side remark at a routine appointment.

And now you know why this section stands so far forward.

Three causes that look the same in the TSH

Here comes the step that is missing from many explanatory texts and that shapes everything else.

A low TSH tells you that too much thyroid hormone is on the move. It does not tell you why. And there are at least three very different reasons for the same laboratory picture.

Simplified comparison following Lee and Pearce (JAMA 2023) and the ETA guideline 2018. Assigning a cause in the individual case belongs in medical hands.

The TRAb value as the point that sets the switch

Picture the TSH receptor as an ignition lock. Normally only one key fits into it, and the pituitary hands that key out in measured doses. In Graves disease a duplicate key sits in the lock and is never pulled out. That is why hormone rises even though the control centre has long switched off.

The European guideline explicitly recommends measuring TRAb at three points: for the diagnosis and its differentiation, before a planned end of antithyroid drugs, and in pregnancy. What the value can do and where its limits lie is described in Thyroid blood values: which ones really count.

One clarification that often causes confusion: TRAb is not the same as TPO antibodies. TPO belongs to the Hashimoto picture, TRAb to the Graves picture. Both are autoimmune thyroid conditions, but they attack at different places and lead in different directions. More on this in Lowering Hashimoto antibodies and in Hashimoto: causes in the immune system.

When a nodule is the sender, and when it is only a phase

Functional autonomy has a history of its own in Germany. We were an iodine deficiency region for decades. A thyroid that received too little raw material for a long time grows and forms districts that at some point keep running on their own. If a lot of iodine then arrives suddenly, for example through a contrast medium, hyperthyroidism can follow. No immune system is involved here, so there is also no remission to wait for. How a nodule is investigated is described in Nodules and goiter, properly investigated.

The third variant is the one most often misclassified. When the thyroid becomes inflamed, for example after a viral infection or after a birth, tissue is damaged and releases stored hormone. In the laboratory this looks like hyperthyroidism, but it is a leak and not overproduction. An antithyroid drug slows new production. Where nothing is being produced, there is nothing for it to slow.

And now you know why I ask first about the sender and not about the brake pedal.

The three conventional paths, honestly side by side

At this point some people expect an integrative physician to distance himself. You will not get that here.

Antithyroid drugs, radioiodine therapy and surgery are established procedures with decades of experience and hard numbers. I do not see my task as calling them into question, but as adding the questions that get lost in a fifteen-minute conversation.

Basis: ETA guideline 2018, ATA guideline 2016, EUGOGO 2021. Germany additionally has its own documents in the AWMF register: the nuclear medicine recommendation on radioiodine therapy (031-003) and the S2k guideline on surgical therapy of benign thyroid disease (088-007).

Thiamazole is the standard case in Europe, propylthiouracil above all in the first trimester of a pregnancy. That there are two agents reflects a weighing of two risk profiles. A meta-analysis of thirty studies found liver damage more often with propylthiouracil, at an odds ratio of 2.40, and malformations in the first trimester more often with thiamazole, at 1.29. For agranulocytosis and skin reactions the two did not differ. Which agent fits which phase of life is decided by the treating practice. A switch or a discontinuation never belongs in self-management, not even when you read numbers here that unsettle you.

If TRAb stay clearly raised after 12 to 18 months, there are two defensible paths: continue treatment and measure again later, or decide for radioiodine or surgery. The longer variant is not a fallback. A meta-analysis of six studies with treatment beyond 24 months found 57 percent remission with 19.1 percent side effects, of which 1.5 percent were serious.

Surgery ends hyperthyroidism immediately. It is the choice with a very large thyroid causing pressure symptoms, with a suspicious nodule, with active eye involvement and with a near-term wish to conceive. The European guideline puts one sentence on this that I consider the most important of the chapter: this operation belongs in the hands of experienced, high-volume surgeons. Bleeding, the vocal cord nerve and the parathyroid glands depend measurably on the routine of the centre.

Many people are irritated when they receive a levothyroxine prescription afterwards. It feels like a mistake and is usually intentional. Hypothyroidism can be replaced and steered through blood values. Uncontrolled hyperthyroidism cannot, and it costs bone and heart rhythm.

And now you know why I consistently place integrative approaches next to the treatment and not against it.

Who stays in remission and who does not

One of the most burdensome experiences in Graves disease is the moment after the relief. The values are good, the medicine has been stopped, and half a year later the hands are trembling again.

Almost every explanatory text says: about fifty percent. That is correct as an average and worthless as a decision aid.

First the term. Remission means that the condition is at rest. It does not mean that it is gone. Graves disease is a chronic autoimmune condition, and the predisposition stays. What can change is the activity.

On top of this comes a factor that appears in no score and is measurable nonetheless: smoking. In the meta-regression by Azizi and Malboosbaf, smoking was linked with a clearly lower remission rate. And the European guideline recommends measuring TRAb before the planned end of treatment. That turns stopping from a bet into an informed decision, made in the treating practice.

And now you know why on the topic of relapse I ask about the TRAb trajectory and not about a gut feeling.

The eyes: thyroid eye disease, stopping smoking and the selenium trial

There is a moment many people with Graves disease describe. They look at an old photograph and do not recognise themselves. The gaze has become a different one.

The eye socket is a bony box whose volume cannot change. If something swells inside it, the space cannot grow along, and the eye gives way forwards. The reason lies in the connective tissue cells of the orbit. They carry the same TSH receptor as the thyroid, plus the receptor for the growth factor IGF-1. The TRAb antibodies dock there as well. The cells then form more water-binding sugar molecules and partly turn into fat cells.

The European EUGOGO guideline names five risk factors: smoking, a fluctuating thyroid function, a high TRAb titre, radioiodine therapy and raised cholesterol. Four of them can be influenced.

A meta-analysis of four randomised trials confirmed this picture in 2024: the Clinical Activity Score fell more strongly with selenium, quality of life, visual function and psychological wellbeing improved, and the effects held over twelve months. And now the limitation that is usually missing from advice texts. For proptosis itself, meaning the forward protrusion of the eyeball, no difference was found. What improved was inflammatory activity, lid aperture and quality of life. Second limitation: EUGOGO explicitly restricts the recommendation to selenium deficient regions. More on how to place selenium, zinc, iron and vitamin D is described in Selenium, zinc, iron and vitamin D.

That cholesterol appears on the risk list surprises many. The background is the new formation of fat tissue in the orbit. In the STAGO trial from Pisa, 51 percent reached the orbitopathy endpoint with added atorvastatin compared with 28 percent without a statin. That is a signal, but it is an open phase 2 trial at a single centre in people with raised LDL.

For severe active courses, EUGOGO names intravenous methylprednisolone with mycophenolate as first line. For some years there has additionally been teprotumumab, an antibody against the IGF-1 receptor. In the pooled analysis of two randomised trials with 171 participants, proptosis receded by at least 2 millimetres in 77 percent, compared with 15 percent on placebo, with a number needed to treat of 1.6. The price for this: muscle cramps in 18 percent, hearing impairment in 10 percent, raised blood sugar in 8 percent. This belongs in specialised centres.

And now you know why with the eyes, stopping smoking and stable thyroid values come before any supplement.

What an integrative view additionally looks at, and how solid that is

Now comes the section where many integrative texts get blurry. I try it the other way round and state for every point which level the evidence sits on.

Vitamin D, level documented association without intervention data. A meta-analysis of twenty case control studies shows lower vitamin D levels and more frequent deficiency in autoimmune thyroid disease, at an odds ratio of 2.99. The direction is open. Chronic inflammation and less time outdoors can lower the level just as much as a low level might favour autoimmunity. An intervention trial with clinical endpoints in Graves disease does not exist.

L-carnitine, level one small randomised trial without confirmation. Benvenga and colleagues studied 50 women over six months in 2001 while they were on TSH-suppressive levothyroxine, meaning a drug-induced hyperthyroidism. In the placebo group symptoms and laboratory values worsened, in the carnitine phases they stayed stable. The idea behind it is elegant: not slowing the gland, but inhibiting the entry of the hormone into the cell nucleus. But 50 participants, no autoimmune hyperthyroidism, over twenty years old and without larger confirmation. A hint, not a basis for therapy.

Stress, level plausible and contested. The Swedish case control study by Winsa from 1991 is to this day the strongest single piece of work: 208 newly diagnosed Graves patients, 372 controls, and in the category with the highest burden an odds ratio of 6.3. Family thyroid disease gave 3.6, which incidentally opens the genetic lens. Against this stands a literature review from 1993 that saw no good evidence for an influence of psychological traits on thyroid disease. Add the design weakness: whoever has received a diagnosis remembers the months before it differently. I consider a link plausible and still do not treat it as proven. How the stress axis works physically is described in Cortisol and the HPA axis.

Gut flora, level cross-sectional data. A systematic review from 2026 pooled 25 studies, among them 19 Graves studies with 713 patients and 546 controls. The diversity of the gut flora was reduced in 62.5 percent of the stool samples, and the ratio of Firmicutes to Bacteroidetes altered in 66.7 percent of the studies. The authors themselves name two limitations: 21 of the 25 studies come from China, and the role of these genera remains, by their own assessment, largely hypothetical. Why the gut barrier is nevertheless thought about in autoimmune processes is described in Leaky gut and intestinal permeability.

And now you know why there is no supplement list in this article.

Nutrition in hyperthyroidism, above all the iodine question

Hardly any topic creates fear so quickly. After the diagnosis many people first strike out iodised salt and read every ingredient list twice. That is understandable, and it mostly misses the core.

Leung and Braverman summarised in 2014 what is known about the sources and consequences of excessive iodine intake. The reference intake for non-pregnant adults is 150 micrograms per day, and amounts above that are as a rule well tolerated. The risk of iodine-induced dysfunction is raised, however, in pre-existing thyroid disease, at older age, and in fetuses and newborns. The sentence "iodine is fuel on the fire" is therefore true for a particular starting position and for large amounts. For iodised table salt in everyday life it is not true.

What matters in practice are the large sources: seaweed and kelp products with strongly varying iodine content, iodinated contrast media in CT and cardiac catheterisation, the heart drug amiodarone and high-dose iodine courses. If you have thyroid disease, these points belong in the history before anybody adds anything. The whole iodine question is set out in Putting iodine in perspective.

Why calories in the body are not a pure arithmetic quantity but depend on the hormonal situation is described in Why a calorie in the body is not a calorie.

And now you know why I do not talk about avoiding iodine first here, but about protein.

The time afterwards, when hyperthyroidism turns into hypothyroidism

There is a sentence I often hear in my practice, and it always comes a little quietly: surely I should be feeling well by now.

And because honest placement belongs with it: that was not a randomised trial. The radioiodine group was older and probably had longer courses behind them, the reference data came from Denmark, and no information was available on thyroid status at the time of the survey. No argument against radioiodine follows from this work. It is an argument for taking the time afterwards seriously.

Weight gain after treated hyperthyroidism has two speeds as an explanation. The resting metabolic rate was raised, and appetite adapted to it. As soon as the values are in the target range, energy expenditure drops quickly, while eating behaviour takes longer. On top of that: part of what was lost was muscle and water, not fat. What comes back without targeted loading is more often fat tissue. That is not weakness of will, it is physiology with a delay. More on this in Calorie deficit: why it is true and still not enough.

Here the cluster connects again. After radioiodine or surgery, replacement with levothyroxine follows as a rule. For some people that fits well, for others symptoms stay even though the TSH sits in the target range. One possible explanation concerns the conversion of T4 into the active T3 in the tissue, see From T4 to T3: the conversion. Lingering symptoms on replacement are covered in Levothyroxine and lingering symptoms. Combination preparations from animal thyroid come up regularly in this context, here explicitly only as a topic that exists and not as a recommendation: Desiccated thyroid extract (NDT). And because the thyroid rarely stands alone: The thyroid and female hormones.

And because the look at the warning signs stands far forward in this article, it belongs at the end too. The opposite direction can also run out of control if hypothyroidism after radioiodine or surgery stays untreated for too long. Increasing slowing down, marked sensitivity to cold, a very slow pulse, swelling in the face, and above all growing drowsiness or confusion belong in prompt medical assessment. This is rare, because these procedures are followed up anyway. It is still the reason why the blood checks in the first months afterwards are not a formality.

And now you know why at the last appointment I ask about sleep and not only about the TSH.

Frequently asked questions about Graves disease and hyperthyroidism

These are the questions that come to me most often on this topic, in the consultation room as well as by email.

Where the thyroid docks onto the rest of the body

Hyperthyroidism does not stand on its own. It hangs on the stress axis, on the gut barrier, on the micronutrient household and on the question of how the body settles its energy accounts. Several paths lead onwards from here.