What Causes You to Have a Low Thyroid Count?

The medical term for low thyroid count is hypothyroidism. Common causes of hypothyroidism include Hashimoto’s thyroiditis, surgical removal of the thyroid gland and radiation treatment. Other causes include radioactive iodine treatment, insufficient iodine in the diet, pituitary gland disorder and certain medications, notes WebMD.

Hypothyroidism is an illness of the thyroid gland that prevents it from making enough thyroid hormone. Thyroid hormone is responsible for ensuring the body performs its normal functions. A low thyroid count in the blood affects the body, and makes it weak and tired, indicates WebMD. Hashimoto’s thyroiditis is an autoimmune ailment where the body produces antibodies to attack and destroy the thyroid gland.

Treating cancers such as lymphoma with radiation causes a damage to the thyroid cells. Destruction of thyroid cells reduces the production of thyroid hormone. Radioactive treatments also destroy thyroid cells, reveals WebMD. Surgical operations involving the removal of part of the thyroid gland also contributes to low thyroid count. In addition, medications such as lithium and amiodarone also reduce thyroid count.

Children with thyroid glands that don't function properly or those born without the glands may suffer from a condition known as congenital hypothyroidism, states Healthline. Too little or excessive iodine may also cause this condition. Stroke, trauma or a tumor can damage the pituitary gland, thus inhibiting the production of thyroxine and causing hypothyroidism.

Iodine is an important component in the production of the thyroid hormone. The body does not produce iodine, hence the need to acquire it from the diet. A low-iodine diet can reduce thyroid count in the blood. However, this is a rare cause as there are plenty of foods that contain iodine, claims WebMD. The pituitary gland produces the thyroid-stimulating hormone that regulates thyroid-hormone production. A problem with the gland affects the thyroid count.