Often the symptoms of a lack of thyroid hormone are not very obvious.
A lack of thyroid hormone in the body is called hypothyroidism.
Abnormal thyroid tissue within these nodules produces too much thyroid hormone.
Canine hypothyroidism due to lymphocytic thyroiditis can often be controlled well with thyroid hormone replacement therapy Myasthenia gravis - prognosis is guarded.
When there are increased levels of thyroid hormone in the blood the patient is said to have thyrotoxicosis.
