During a thyroidectomy, the thyroid gland is either partially or entirely removed, sometimes causing symptoms associated with reduced thyroid function, such as depression, states Mayo Clinic. Reduced thyroid function, also known as hypothyroidism, can have symptoms that include exhaustion, difficulty concentrating and excessive sleeping, all of which can contribute to the development of depression or can mimic the symptoms of depression, according to WebMD.
The thyroid is a gland at the base of the neck that produces hormones that regulate metabolic functions such as heart rate and the amount of calories the body burns, notes WebMD. In addition to depression, other symptoms of hypothyroidism include weight gain, bodily aches, hair loss and constipation, all of which could result in alterations to mood and might contribute to the development of depression.
Depression is the most common psychiatric condition associated to thyroid disorders, according to the Journal of Thyroid Research. After a thyroidectomy, the medications that replace the depleted thyroid hormones can sometimes treat alterations in mood that arise after the surgery. There are many types of medications used to replace the function of the thyroid, and sometimes these drugs are also prescribed to increase the efficacy of antidepressant medications that have been prescribed to the patients.