Thyroidectomy is removal of thyroid gland.
conditions that require thyroidectomy;
thyroid tumor, thyroid nodules or hyperthyroidism.

In this case as we can see it’s hyperthyroidism, which occurs when the thyroid gland produces too much thyroid hormone.
Symptoms;
•Losing weight
• tachycardia.
•arrhythmia.
•Pounding of the heart, sometimes called heart palpitations.
•Increased hunger.
•Nervousness, anxiety and irritability.
•Tremor, usually a small trembling in the hands and fingers.
•Sweating.
•heat intolerance
•Insomnia