biology

Signs and symptoms of Graves' disease

Signs and symptoms of Graves' disease is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Signs and symptoms of Graves' disease rather than just read about it. In short: The signs and symptoms of Graves' disease generally result from the direct and indirect effects of hyperthyroidism, although they can also be caused by other thyroidal conditions, such as Graves' ophthalmopathy, goitre and pretibial myxedema. These clinical manifestations can involve virtually every system in the body.

Key takeaways

Signs and symptoms of Graves' disease belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Signs and symptoms of Graves' disease to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Signs and symptoms of Graves' disease from memory before moving on to harder problems.

Reference excerpt

The signs and symptoms of Graves' disease generally result from the direct and indirect effects of hyperthyroidism, although they can also be caused by other thyroidal conditions, such as Graves' ophthalmopathy, goitre and pretibial myxedema. These clinical manifestations can involve virtually every system in the body. The mechanisms that mediate these effects are not well understood. The severity of the signs and symptoms of hyperthyroidism is related to the duration of the disease, the magnitude of the thyroid hormone excess, and the patient's age. Although the majority of patients experience significant improvement and remission after proper medical care, health care providers should be aware of variability in individual response to hyperthyroidism and individual sensitivity to thyroid hormone fluctuations. Patients with Graves' disease can also undergo periods of hypothyroidism (inadequate production of thyroid hormone; see symptoms of hypothyroidism), due to the challenges of finding the right dosage of thyroid hormone suppression and/or supplementation. The body's need for thyroid hormone can also change over time, such as in the first months after radioactive iodine treatment (RAI). Thyroid autoimmune diseases can also be volatile, as hyperthyroidism can interchange with hypothyroidism and euthyroidism.

General symptoms

Skin/Hair/Nails Pretibial myxedema: Waxy, discolored induration of the skin Warm and moist skin Redness of the elbows is frequently present. It is probably the result of the combination of increased activity, an exposed part, and a hyperirritable vasomotor system. Thin and fine hair Brittle nails Plummer's nail

Nose/Sinuses Chronic sinus infections

Neck Goitre (enlarged thyroid): If the thyroid grows large enough, it may compress the recurrent laryngeal nerve, producing vocal cord paralysis, dysphonia, and even respiratory stridor. Compression of the sympathetic chain may result in Horner's syndrome.

Eyes Graves' ophthalmopathy (protrusion of one or both eyes)

Respiratory/Cardiac Shortness of breath Cardiovascular features may include hypertension, and heart rate that may be rapid or irregular in character; these may be perceived as palpitations. Less common findings include high-output heart failure, left ventricular hypertrophy, premature atrial and ventricular contractions, atrial fibrillation, congestive heart failure, angina, myocardial infarction, systemic embolization, death from cardiovascular collapse and resistance to some drug effects (digoxin, coumadin).

Gastrointestinal Gastrointestinal symptoms. This includes increased bowel movements, but malabsorption is unusual.

Musculoskeletal Hyperreflexia, with a rapid relaxation phase. Tremor (usually fine shaking; tremor of the outstretched fingers). In a small study of newly diagnosed hyperthyroid patients, tremor was observed in 76% of them. Some studies lay the cause for hyperthyroid tremor with a heightened beta-adrenergic state, others suggest an increased metabolism of dopamine. Weakness or muscle weakness (especially in the large muscles of the arms and legs). This latter occurs in 60 to 80 percent of patients with untreated hyperthyroidism. Muscle weakness is rarely the chief complaint. The likelihood and degree of muscle weakness is correlated with the duration and severity of the hyperthyroid state, and becomes more likely after the age of 40. Muscle strength returns gradually over several months after the hyperthyroidism has been treated. Muscle degeneration

Neurologic A distinctly excessive reaction to all sorts of stimuli. A marked increase in fatigue, or asthenia, is often prominent. This increased weariness may be combined with hyperactivity; patients remark that they are impelled to incessant activity, which, however, causes great fatigue. Neurological seizures, neuropathy from nerve entrapment by lesions of pretibial myxedema, and hypokalemic periodic paralysis may occur. Athetoid, choreia, and corticospinal tract damage, are rare. An acute thyrotoxic encephalopathy is very rare.

Endocrine Weight loss despite normal or increased appetite. Some patients (especially younger ones) gain weight due to excessive appetite stimulation that exceeds the weight loss effect. Increased appetite. Increased sweating Heat intolerance Abnormal breast enlargement in men Augmented calcium levels in the blood (by as much as 25% – known as hypercalcaemia). This can cause stomach upset, excessive urination, and impaired kidney function. Diabetes may be activated or intensified, and its control worsened. The diabetes is ameliorated or may disappear when the thyrotoxicosis is treated. Reproductive symptoms in men may include reduced free testosterone (due to the elevation of testosterone-estrogen binding globulin level), diminished libido, erectile dysfunction and (reversible) impaired sperm production with lower mean sperm density, a high incidence of sperm abnormalities, and reduced mobility of the sperm cells. Women may experience infrequent menstruation or irregular and scant menstrual flow along with difficulty conceiving, infertility and recurrent miscarriage.

Psychiatric Insomnia

Other Evidence of mild or severe liver disease may be found.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Signs and symptoms of Graves' disease

Start with the simplest possible case. Write down what Signs and symptoms of Graves' disease claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Signs and symptoms of Graves' disease before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Signs and symptoms of Graves' disease ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Signs and symptoms of Graves' disease

In research: Signs and symptoms of Graves' disease appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Signs and symptoms of Graves' disease in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Signs and symptoms of Graves' disease is common in secondary-school and first-year university syllabi. It links to neighbouring topics Autoimmune diseases, Symptoms and signs: Endocrinology, nutrition, and metabolism, Thyroid disease, so understanding it makes those chapters shorter.
In everyday life: Look for Signs and symptoms of Graves' disease outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Signs and symptoms of Graves' disease in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Signs and symptoms of Graves' disease means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Signs and symptoms of Graves' disease out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Signs and symptoms of Graves' disease in simple terms?

Why does Signs and symptoms of Graves' disease matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Signs and symptoms of Graves' disease?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Signs and symptoms of Graves' disease.