Hyperthyroidism, or hyperthyroidism for short, is a clinical syndrome caused by overproduction of thyroid hormones due to a variety of reasons. The thyroid gland is a very important endocrine organ in our body. Its main function is to secrete thyroid hormones, which are closely related to our growth, development, material metabolism, and the functions of the heart, liver, brain and other organs. Hyperthyroidism is not commonly known as “big neck disease” (refers to goiter caused by iodine deficiency, which is now rare after the implementation of universal salt iodization to prevent and control iodine deficiency diseases), and it can not be called “iodine high” (this name is popular but not standardized in many patients with thyroid disease). (this name is popular among many thyroid patients, but it is not standardized and not accurate), etc.. The causes of hyperthyroidism are relatively complex: 1. Hyperthyroidism is essentially an autoimmune disease. Simply put, the patient’s body produces a certain antibody, and this antibody stimulates the growth of thyroid tissue and secretion of thyroid hormones, which results in the enlargement of the thyroid gland and the clinical symptoms of hyperthyroidism. 2, the triggering factors of hyperthyroidism include nervous rhythm of life, overwork, stress, sudden changes, etc. These factors are likely to induce the sudden occurrence of hyperthyroidism, aggravation of the condition or recurrence of the condition after a period of improvement. 3, just as diabetes is not caused by eating too many sweets, hyperthyroidism is never caused by eating iodine-rich seafood. However, because iodine is the main raw material for synthesizing thyroid hormones, after the diagnosis of hyperthyroidism, eating a lot of seafood may promote the synthesis and secretion of thyroid hormones, which will aggravate the condition of hyperthyroidism, so the patient should refrain from eating iodine-rich foods and medicines, such as kelp, seaweed, shrimp, seafood, sea crabs, algae and so on. 4, hyperthyroidism has a certain genetic tendency, that is to say, in individual families will appear in the case of aggregation, that is, young and old multi-generational people have a disease. But hyperthyroidism is not a genetic disease. In other words, parents should not worry that their own hyperthyroidism will be passed on to their future babies. The clinical manifestations of hyperthyroidism are varied. Self-perceived symptoms usually include: 1. Thickening of the neck, often unintentionally discovered by relatives or friends, is due to enlargement of the thyroid gland, and a few patients with significant enlargement may have symptoms such as breathlessness, poor breathing, and impaired swallowing when the trachea is severely compressed. 2. Rapid heartbeat (or arrhythmia), which may be accompanied by chest tightness, shortness of breath and other discomforts. 3.Increased food intake, but continued weight loss, or even significant weight loss. The frequency of stools increases and is not shaped. There are also a few patients with anorexia and nausea. 4.Fatigue and weakness, fear of heat and sweating. 5, nervousness and anxiety, irritability. 6, some patients may also appear protruding eyes, photophobia, tearing, vision loss and other eye symptoms. Patients in the consultation, the doctor examination may find: goiter; heart rate accelerated or arrhythmia; hand tremor; protruding eyes; pre-tibial mucous edema (swelling of the front of the calf, the surface of the skin is rough, hyperpigmentation, acupressure without depression) and so on. It is worth proposing that the symptoms of hyperthyroidism in the elderly are often not typical. In some patients, the heart does not beat faster. Wasting is obvious, but it is often not accompanied by hunger, overeating, etc. Some patients even mainly manifest anorexia, nausea, vomiting, abdominal distension, etc.. Depression and apathy are more common. If any of these conditions occur, it is necessary to go to the hospital in time and ask a specialist to make a clear diagnosis. Diagnostic procedures include: 1. Ask about the patient’s medical history, understand the patient’s symptoms, onset of disease and diagnosis and treatment, etc. 2. 2.Systematic and comprehensive medical examination. 3.Laboratory tests, including thyroid function, thyroid-related antibodies, blood test, liver and kidney function. 4.Thyroid ultrasonography, to understand the degree of thyroid enlargement, tissue echogenicity, blood flow and the presence of nodules. 5, thyroid ECT examination, and thyroiditis for differential diagnosis, which is very important. Because although the clinical manifestations of the two are similar, the evolution of the disease, treatment program and prognosis are very different. When the patient is diagnosed with hyperthyroidism, it is necessary to choose an appropriate treatment plan under the guidance of a specialist.