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The thyroid gives too much gas — palpitations, restlessness and weight loss follow, and it can be well slowed.
Also known as: hyperthyroidism · Graves’ disease
Open in the tool — with search and all the links →This compilation is for information and replaces neither medical diagnosis nor treatment. If you have symptoms, see a doctor.
Overactivity means more thyroid hormone is circulating than the body currently needs. That is not a diagnosis but a state — and the question behind it is always where the excess comes from. Four routes are common. First Graves’ disease, where antibodies drive the gland. Second one or more autonomous nodules that produce on their own account without listening to the control; they become more common with the years. Third an inflammation of the gland, after an infection or after a birth: here nothing extra is made, stored hormone is released — the phase passes by itself and afterwards often tips into underactivity for some months. Fourth too much hormone from outside, from tablets or from preparations containing thyroid extract. This distinction is not academic: it decides whether to slow, to remove, to wait, or only to adjust a dose. In everyday life overactivity shows as acceleration — pulse, gut, thoughts, sense of warmth. In older people this loud picture is sometimes missing altogether; new atrial fibrillation, weight loss or an unfamiliar weakness may then be the only clues.
Over- or underactivity should be diagnosed and treated (e.g. hormone replacement) — the key step.
Iodine is the building block of thyroid hormones; both deficiency and excess can harm. Iodised salt and sea fish cover the need.
Antibodies, ultrasound and where appropriate a scan answer which of the four routes is present. A passing inflammation needs no brake, an autonomous nodule no antibody-directed treatment.
Inflammatory forms run in phases: too much first, then too little, then usually normal again. Braking permanently too early treats a phase that passes on its own.
One of the commonest causes is simply too much thyroid hormone from the tablet — including from glandular-extract preparations offered for weight loss or tiredness. It is the only form that can be fully corrected within a few weeks.
The heart carries the main load. A resting pulse that stays high, or an irregular beat, belong documented, because the urgency follows from them.
A TSH suppressed for years speeds up bone loss even when you feel well. Over a long period bone density belongs in the conversation.
Very rarely an untreated overactive thyroid runs out of control — with high fever, a very fast pulse, vomiting and confusion. That is an emergency and not a case for waiting.
Antithyroid drugs slow the making of hormone, not the release of the store already formed. So it takes two to six weeks before anything changes. Beta blockers take away the racing heart and tremor in the meantime.
About two in a hundred women and one in a thousand men are affected. The resting pulse is often above ninety, and weight falls over weeks despite a good appetite. After treatment starts it takes two to six weeks to improve, because the filled store must empty first. A check follows at four to six weeks — using the free hormones, because TSH can stay low for months.
The pulse stays high even at rest. An irregular pulse is why the thyroid is always measured when atrial fibrillation appears for the first time.
Falling asleep does not work, thinking runs faster than usual. Often first filed under stress or an anxiety disorder.
It is the combination that stands out: eating more and still losing. In some the weight even rises, because appetite grows more than turnover.
In a T-shirt in winter, sweating without effort. The skin is smooth and warm, not cold and dry as in underactivity.
A fine tremor of the outstretched fingers, often noticed on the coffee cup or in handwriting.
The loud picture is often missing. Instead of restlessness there is apathy, muscle weakness and unexplained weight loss — so overactivity is often recognised late here.
The one supplement that does not belong here: extra iodine can worsen or trigger an overactive thyroid. Kelp and algae capsules often contain many times the daily need without saying so on the front.
For the mild eye involvement of Graves’ disease a European study at 100 µg twice daily over 6 months showed fewer complaints. That applies to this situation, not to overactivity in general.
An overactive thyroid breaks down bone for as long as it runs. Calcium and vitamin D therefore belong alongside — 1000 mg a day from food and supplement together.
In overactivity a lot of iodine can make things worse. Seaweed and contrast media are meant — a portion of nori holds little, 100 g of kombu can bring a hundred times the daily need.
Basal metabolism often runs 20–40 % higher, weight falls despite normal eating. At the same time calcium leaves the bone — 1000 mg a day and vitamin D are watched.
Studied in the eye involvement of Graves disease, with a good result in a European trial.
The inner restlessness is part of the illness — relaxation methods soften it without treating the cause.
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