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After long-term heavy strain, levels of thyroid hormones decrease. [2] This is exacerbated by other stressors such as undernutrition and lack of sleep, such as in a military training setting. During endurance exercise, before exhaustion, elevated thyroid hormone levels may happen due to increased expected energy demand (type 2 allostatic load). [2]
An autonomous thyroid nodule or "hot nodule" is one that has thyroid function independent of the homeostatic control of the HPT axis (hypothalamic–pituitary–thyroid axis). According to a 1993 article, such nodules need to be treated only if they become toxic ; surgical excision ( thyroidectomy ), radioiodine therapy , or both may be used.
Thyroid disease is a medical condition that affects the structure and/or function of the thyroid gland.The thyroid gland is located at the front of the neck and produces thyroid hormones [1] that travel through the blood to help regulate many other organs, meaning that it is an endocrine organ.
Thyroid nodules are often found on the gland, with a prevalence of 4–7%. [59] The majority of nodules do not cause any symptoms, thyroid hormone secretion is normal, and they are non-cancerous. [60] Non-cancerous cases include simple cysts, colloid nodules, and thyroid adenomas.
A goiter is a diffuse, often symmetric, swelling of the thyroid gland visible in the anterior neck that may develop. [13] The thyroid gland may become firm, large, and lobulated in Hashimoto's thyroiditis, but changes in the thyroid can also be non-palpable. [14] Enlargement of the thyroid is due to lymphocytic infiltration, and fibrosis. [15]
The thyroid gland is extremely painful, rigid, and swollen, which can be symmetrical or asymmetrical. [2] Approximately half of affected adolescents and two-thirds of adults have widespread thyroid gland involvement. [3] [5] Thyroid nodules are seen in one-fourth of adult patients. [6] The surrounding skin is occasionally warm and erythematous.
An incidentally discovered colloid nodule with calcification, shown on CT scan of a 58-year-old female patient. a Non-enhanced axial CT scan of the neck demonstrates a coarse calcification at the left thyroid inferior pole. b Sagittal grey scale ultrasound of the thyroid demonstrates a heterogeneous nodule with a predominant cystic component.
Many small thyroid cancers (mostly papillary type) rarely grow or metastasize. Some have stated that thyroid cancers are overdiagnosed and will rarely cause symptoms, illness, or death, even without treatment. [59] Low grade thyroid cancer is very commonly seen during autopsy studies, with the person dying from other causes. [59] Increasingly ...