Underactive Thyroid More Condition_symptoms What Happens If Thyroxine Doesnt Work For An Underactive Thyroid?

What happens if thyroxine doesnt work for an underactive thyroid? - underactive thyroid more condition_symptoms

My friend has an underactive thyroid and she `s taking 100micrograms shows, however, entering his no improvement, means that 'll need an operation? she is very afraid! Thanks