MICROANATOMY

Detailed explanation-1: -Hyperthyroidism is an overactive thyroid (when it produces too much thyroid hormone). Hypothyroidism is an underactive thyroid (when it does not produce enough). Hypothyroidism is more common than hyperthyroidism. Although the two conditions have different signs and symptoms, sometimes they overlap.

Detailed explanation-2: -Graves’ disease, the most common cause of hyperthyroidism, is an autoimmune disorder. With this disease, your immune system attacks the thyroid and causes it to make too much thyroid hormone.

Detailed explanation-3: -The release of too much thyroxine in the bloodstream is known as thyrotoxicosis. This may be caused by overactivity of the thyroid gland (hyperthyroidism), as in Graves’ disease, inflammation of the thyroid or a benign tumour.

Detailed explanation-4: -Hypothyroidism is a common endocrine disorder resulting from deficiency of thyroid hormone. In the United States and other areas of adequate iodine intake, autoimmune thyroid disease (Hashimoto disease) is the most common cause of hypothyroidism; worldwide, iodine deficiency remains the foremost cause.