Diagnosis of a thyroid problem is made by a doctor or medical professional.

Four main methods of thyroid problems diagnosis are available:

Biopsy

Collection a sample of the thyroid's tissue may be used for discerning whether cancer is present.

Blood test

Thyroid-stimulating hormone (TSH) levels are measured. Elevated TSH levels may suggest an underactive thyroid function (hypothyroidism), while lowered THS levels may indicate overactive thyroid function (hyperthyroidism).

Radioiodine scanning

Radioiodine, commonly iodine-123, may be used for imaging in order to scan. Irregularities can point to thyroid problems: underactivity or overactivity, or even tumor or cancer.

Ultrasound

An ultrasound may be used to assist in determining whether thyroid nodules are cancerous.

Once a diagnosis has been given, the doctor may prescribe a method of treatment based upon the thyroid disease faced by the patient, and any other factors involved.