Causes of Thyroid Cancer

Written by Gong Chun
Oncology
Updated on September 05, 2024
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Regarding the causes of thyroid cancer, they are similar to most malignant tumors. The etiology of thyroid cancer is currently unclear, but some factors have been found to be associated with the onset of thyroid cancer. The first factor is neck radiation; the thyroid is an endocrine organ that is sensitive to radiation, so radiation exposure may cause carcinogenic changes in thyroid cancer cells. The second factor is genetics; some thyroid cancers have a clear genetic predisposition, the most typical being medullary thyroid cancer, with about 25% of patients showing familial clustering, known as familial medullary thyroid cancer. The third factor is that the rapid increase in the incidence of thyroid cancer also has some reasons, with one recognized reason being advancements in early diagnostic methods, allowing for the easy detection of numerous early lesions. The fourth is iodine intake, which has been shown to be related to some benign diseases of the thyroid, but its relationship with thyroid cancer itself needs further study.

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Written by Gong Chun
Oncology
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Causes of Thyroid Cancer

Regarding the causes of thyroid cancer, they are similar to most malignant tumors. The etiology of thyroid cancer is currently unclear, but some factors have been found to be associated with the onset of thyroid cancer. The first factor is neck radiation; the thyroid is an endocrine organ that is sensitive to radiation, so radiation exposure may cause carcinogenic changes in thyroid cancer cells. The second factor is genetics; some thyroid cancers have a clear genetic predisposition, the most typical being medullary thyroid cancer, with about 25% of patients showing familial clustering, known as familial medullary thyroid cancer. The third factor is that the rapid increase in the incidence of thyroid cancer also has some reasons, with one recognized reason being advancements in early diagnostic methods, allowing for the easy detection of numerous early lesions. The fourth is iodine intake, which has been shown to be related to some benign diseases of the thyroid, but its relationship with thyroid cancer itself needs further study.

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Written by Zhao Xin Lan
Endocrinology
1min 12sec home-news-image

Differences between the symptoms of thyroiditis and thyroid cancer

Thyroiditis, if it is acute suppurative thyroiditis, clinical manifestations include fever, local pain in the thyroid, tenderness on palpation, and a hard texture of the thyroid. Examination will show an increase in white blood cells. Subacute thyroiditis may also present with mild fever or high fever and local pain in the thyroid, but compared to suppurative thyroiditis, the increase in white blood cell levels is not as significant in subacute thyroiditis. If it is autoimmune thyroiditis, there may not be obvious symptoms clinically; there may be enlargement of the thyroid, and the thyroid may feel tougher upon palpation. As for thyroid cancer, clinically, if it does not cause hyperthyroidism or hypothyroidism, there are no specific symptoms. When the cancerous tumor is large, there may be an enlargement of the thyroid, the texture of the enlarged thyroid will be very hard, and there will be notable local adhesions. Of course, the main difference can be detected and diagnosed through an ultrasound examination.

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Written by Gong Chun
Oncology
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Symptoms of thyroid cancer

The symptoms of thyroid cancer, the first point is the clinical manifestations of differentiated thyroid cancer. Most differentiated thyroid cancers are asymptomatic, with only occasional palpable nodules of varying sizes and textures, which can sometimes be detected in routine physical and imaging examinations. A few advanced thyroid cancers may produce noticeable symptoms due to large nodules or invasion of surrounding organs, such as compression of the trachea causing breathing difficulties, difficulty swallowing due to pressure on the esophagus, and hoarseness due to compression of the recurrent laryngeal nerve. The second point concerns the specific clinical manifestations of medullary thyroid carcinoma. The specific symptoms of medullary thyroid cancer include persistent watery diarrhea, not accompanied by severe malabsorption in the large intestine, often with facial flushing, some endocrine syndromes, and some associated conditions such as pheochromocytoma, multiple mucosal neuromas, and parathyroid adenomas.

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Written by Gong Chun
Oncology
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How is thyroid cancer diagnosed?

The first point is the diagnostic process for differentiated thyroid cancer. Initially, most patients may not have symptoms, while a minority might show symptoms due to invasion of surrounding organs. Ultrasound examination is the preferred method for diagnosing thyroid nodules. Ultrasound can clarify the number, nature, and location of thyroid nodules, as well as provide information on whether there are abnormally enlarged lymph nodes in the neck. It has a relatively high accuracy in identifying the nature of thyroid nodules. Currently, the most accurate test for determining the nature of thyroid nodules remains the fine needle aspiration cytology, which has a diagnostic sensitivity of 83-92% and specificity of 80-92%, but it is not 100% conclusive. The second point is about the diagnosis of medullary thyroid cancer. Besides the tests common for thyroid cancers, additional tests for medullary thyroid cancer can include fine needle aspiration, ultrasound, and some serological tests, such as calcitonin and carcinoembryonic antigen tests.

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Written by Yan Chun
Oncology
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Will thyroid cancer spread if surgery is not performed immediately after a biopsy?

Thyroid cancer, after undergoing a fine needle biopsy, may spread if surgery cannot be performed immediately, which is a risk of the thyroid cancer biopsy. Fine needle biopsy of the thyroid is a method for obtaining histopathological results and is a gold standard for the clinical diagnosis of thyroid cancer. A biopsy is an invasive examination that causes some degree of harm to the body, hence, informed consent must be obtained from the patient before proceeding. After the biopsy, complications such as local bleeding, swelling, pain, and infection may occur, and the spread of cancer cells at the biopsy site is a significant adverse effect. Therefore, for most thyroid cancer patients, it is advisable to arrange surgery as soon as possible after a biopsy to prevent the disease from spreading.