Thyroid Lobectomy
A thyroid lobectomy — also called a hemithyroidectomy — removes one side of the thyroid gland while leaving the other lobe in place. It is used for selected nodules, small cancers and some benign conditions.
Because part of the gland remains, many people do not need lifelong thyroid hormone replacement.
Last medically reviewed: 15 November 2025
Key points
- A lobectomy removes half the thyroid, leaving the other lobe.
- It is used for some nodules, small cancers and benign disease.
- Many people retain normal thyroid function afterwards.
- The remaining lobe is monitored with blood tests.
When it is used
A lobectomy may be recommended for a nodule that is suspicious or symptomatic but confined to one lobe, for a small low-risk thyroid cancer, or for a benign nodule causing compression.
It is sometimes preferred over total thyroidectomy when the diagnosis is uncertain, because it preserves some thyroid function.
The operation
The surgery is performed under general anaesthetic through a small incision in the lower neck. The surgeon removes the affected lobe while protecting the recurrent laryngeal nerve and parathyroid glands on that side.
The operation usually takes one to two hours, and most people stay in hospital briefly.
Recovery
Expect some neck soreness and tiredness for a week or two. Voice fatigue is common and usually temporary. Heavy lifting and strenuous exercise are avoided for a few weeks.
The scar is placed in a skin crease and fades over time.
Thyroid function afterwards
The remaining lobe often produces enough hormone, so medication may not be needed. Thyroid function is checked after surgery and at intervals; a proportion of people develop hypothyroidism and need levothyroxine.
If the removed tissue proves to be cancer, further surgery or treatment may be discussed.
When to seek urgent medical help
- Breathing difficulty or rapidly increasing neck swelling after surgery.
- Tingling around the mouth, muscle cramps or twitching.
- A voice change that is worsening rather than improving.
This guidance does not replace emergency services. If you are seriously unwell, seek urgent medical care immediately.
Frequently asked questions
Will I need thyroid medication after a lobectomy?
Not necessarily — the remaining lobe often produces enough hormone. Thyroid function is monitored, and some people do need levothyroxine later.
Is a lobectomy safer than a total thyroidectomy?
Both are generally safe. A lobectomy preserves some function but may require completion surgery if cancer is found.
How long is recovery?
Most people return to light activities within one to two weeks and to full activity within a few weeks.
Will I have a scar?
Yes — a small scar in a natural neck crease. It fades over months and can be protected from the sun.
References & further reading
This page is based on established medical knowledge and guidelines from authoritative sources. Always consult a qualified clinician for personal medical advice.
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