Choosing between removing one lobe of the thyroid or the whole gland has lifelong implications. This guide explains the trade-offs.
Hemithyroidectomy
Removes one lobe and the isthmus. Often preserves enough function to avoid lifelong medication. Suitable for unilateral benign disease or low-risk small cancers.
Total thyroidectomy
Removes the whole gland. Required for bilateral disease, larger cancers, multinodular goitre causing symptoms, or where radioactive iodine therapy is planned. Lifelong levothyroxine is required.
Comparison
Hemi: less medication risk, slightly higher recurrence risk on the remaining side. Total: definitive treatment, simpler oncological surveillance, lifelong replacement therapy.
Risks
Nerve injury and parathyroid dysfunction are slightly more likely with total resection because both sides are operated on, but in experienced hands the risk remains very low.
Decision-making
The choice depends on cytology, size, multifocality, family history and patient preference, and is made together at consultation.