Welcome to our QnA. From what you’ve told us, presumably, your doctor must have recommended that you go for a fine needle aspiration biopsy because of the ultrasound findings.
Levothyroxine was likely prescribed because your blood test showed that you were producing too little thyroid hormone. This may be a separate issue that’s unrelated to the nodule.
Thyroid nodules are very common – they exist in about 50% of the population. The vast majority of them (95%) are non-cancerous.
However, a biopsy is often necessary to help a doctor differentiate non-cancerous nodules from cancerous thyroid nodules.
The word “biopsy” is scary to some patients as they imagine a major surgery and lots of cutting, but in the case of a thyroid biopsy, doctors can use a small needle to remove cells. This is known as a fine needle aspiration biopsy.
The needle is placed into the nodule several times, and cells are aspirated into a syringe. The cells are then placed on a microscope slide, stained, and examined by a pathologist.
I’d suggest proceeding with whatever the doctor has recommended for you (as he will have more pertinent information about your findings), and if you are still unsure about the necessity of further investigations he has recommended for you, do raise this in your follow-up appointment with him.
Cheers
