Microwave Ablation for Thyroid Nodules: What Patients Should Know
Medically reviewed by Dr Saurabh Bansal (DMC 37887), GI, Laparoscopic and Bariatric Surgeon, THE CLINICS. Last reviewed: October 2026.
If you have been told you have a thyroid nodule, you may have come across "microwave ablation" as a way to treat it without an operation. This guide explains what microwave ablation for thyroid nodules is, who it may suit, how it is done and how it compares with surgery, so that you can have an informed conversation with your doctor.
First, what is a thyroid nodule?
A thyroid nodule is a lump within the thyroid gland at the front of the neck. Nodules are very common, and many are found by chance on an ultrasound done for another reason. Most are benign (not cancer) and cause no trouble. Some, however, grow large enough to cause:
a visible swelling in the neck
a feeling of pressure or something stuck in the throat
difficulty swallowing, or discomfort when lying down
a change in voice or, rarely, breathing difficulty
A small number of nodules make too much thyroid hormone (an "overactive" or "hot" nodule), and a small proportion are cancerous, which is why every nodule should be properly assessed.
What is microwave ablation (MWA)?
Microwave ablation is a minimally invasive, image-guided treatment. A thin antenna (about the size of a biopsy needle) is passed through the skin into the nodule under live ultrasound guidance. Microwave energy then heats and destroys the nodule tissue from the inside. Over the following weeks and months, the body gradually clears the treated tissue and the nodule shrinks.
MWA belongs to a group called thermal ablation, along with radiofrequency ablation (RFA) and laser ablation. It is done through a needle puncture, so there is no surgical incision, and it is usually an outpatient procedure under local anaesthesia.
Who may be suitable?
International guidance, including the 2020 European Thyroid Association guideline, suggests thermal ablation may be considered for adults who:
have a nodule confirmed as benign, usually on two separate fine-needle aspiration (FNAC) tests
have symptoms from the nodule (pressure, swallowing discomfort) or a cosmetic concern about a visible lump
prefer not to have surgery, or are not good candidates for an operation
Ablation may also be considered for selected small overactive nodules, and for cystic nodules that refill after ethanol treatment.
Who is not suitable?
Ablation is generally not recommended for:
nodules that cause no symptoms or cosmetic concern, which are usually just monitored
nodules with suspicious features on ultrasound or uncertain biopsy results
confirmed thyroid cancer, where surgery is the standard treatment (ablation for very small low-risk cancers is still being studied and is offered only in selected settings)
very large goitres extending behind the breastbone
Tests needed before ablation
Before anyone offers ablation, the nodule must be carefully assessed. This usually includes:
a detailed neck ultrasound by an experienced operator
thyroid blood tests (TSH, and sometimes calcitonin)
FNAC, often repeated, to confirm the nodule is benign
a voice check and sometimes a look at the vocal cords, especially if you have had neck surgery before
Getting the diagnosis right comes first. Treating a nodule that later proves to be cancer could delay proper treatment.
What happens during the procedure
You lie on your back with the neck slightly extended.
The skin is cleaned and local anaesthetic is injected around the thyroid. Some centres also use light sedation.
Under ultrasound, the antenna is guided into the nodule, often through the middle part of the thyroid (the isthmus) for safety.
Fluid may be injected around the thyroid to protect nearby structures such as the voice nerve and windpipe.
The antenna is moved step by step through the nodule while microwave energy is applied ("moving-shot technique").
The treatment itself often takes 10–20 minutes. You are observed for a short while and most people go home the same day with a small dressing.
After the procedure and follow-up
Mild neck discomfort, swelling or a feeling of heat is common for a day or two and is usually eased with simple painkillers and cold packs. Most people return to normal activities within a day or two.
The nodule does not disappear immediately. It shrinks gradually over months. Published studies, including an Indian series of benign nodules, report substantial volume reduction over the following months, with improvement in symptoms and appearance, but results vary with nodule size and type. Large nodules may need more than one session, and some nodules regrow over time and need further treatment or surgery. You will usually have follow-up ultrasound scans and thyroid blood tests at intervals agreed with your doctor.
Possible side effects and risks
Thermal ablation is generally well tolerated, but no procedure is without risk. Possible problems include:
pain or discomfort spreading to the jaw, ear or chest during treatment
bruising or bleeding around the thyroid (haematoma)
a change in voice from heat affecting the recurrent laryngeal nerve, which is usually temporary and often recovers over weeks to months
skin burns at the needle site (uncommon)
nodule rupture, causing a painful swelling later
changes in thyroid function, which are uncommon
The skill and training of the operator matter. The American Thyroid Association advises that ablation be done by clinicians with dedicated training, within teams that can manage complications and arrange surgery if needed.
Microwave ablation vs surgery vs other options
Watchful monitoring
Most benign nodules without symptoms only need periodic ultrasound and blood tests.
Thyroid surgery
Removing half (hemithyroidectomy) or all (total thyroidectomy) of the thyroid is the standard treatment for cancer, suspicious nodules, large goitres and nodules causing significant pressure. It provides tissue for a definite diagnosis and removes the nodule completely. It needs a general anaesthetic, a neck incision and a short hospital stay, and some patients need lifelong thyroid hormone tablets afterwards.
Other ablation methods (RFA, laser, ethanol)
Radiofrequency and laser ablation have been studied for longer than MWA and work in a similar way. Ethanol (alcohol) injection is usually the first choice for fluid-filled (cystic) nodules. The right choice depends on your nodule and your symptoms. The ablation method available at THE CLINICS is microwave ablation.
What affects the cost?
The cost of thyroid nodule ablation or surgery depends on the size and number of nodules, the number of sessions, the tests and biopsies needed, the facility and the follow-up schedule. Your doctor can give an estimate after assessment.
Microwave ablation for thyroid nodules at THE CLINICS
Microwave ablation for thyroid nodules is available at THE CLINICS. Not every nodule needs treatment, and for some nodules surgery remains the better choice, so every patient is assessed first. Ask Dr Gopal Puri whether thyroid nodule ablation or surgery suits you.
Dr Puri holds an MCh in Breast and Endocrine Surgery from AIIMS, New Delhi, and has 7+ years' experience; his clinical interests include thyroid and parathyroid conditions. At your consultation he will review your ultrasound, FNAC and blood test reports, examine your neck and explain whether monitoring, microwave ablation or thyroid surgery is the right next step for you.
Assessment: Dr Gopal Puri, THE CLINICS Green Park, New Delhi, Monday to Saturday, 6–8 pm
Microwave ablation and thyroid surgery: THE CLINICS MISC, Hauz Khas, New Delhi
Fees: ₹1,500 consultation + ₹100 registration
Insurance facilities available (coverage depends on your policy and on the treatment advised)
Book a thyroid nodule consultation with Dr Gopal Puri. Call THE CLINICS Green Park on +91 84488 30013 or THE CLINICS Hauz Khas on +91 92173 81353, or book online. Please bring your ultrasound, FNAC and thyroid blood test reports.
Related pages
Frequently asked questions
Is microwave ablation a surgery?
No. It is a needle-based, ultrasound-guided procedure, usually done under local anaesthesia without a surgical incision.
Can microwave ablation treat thyroid cancer?
Surgery remains the standard treatment for thyroid cancer. Ablation is mainly used for benign nodules; its use for very small low-risk cancers is still being studied.
Will the nodule go away completely?
Usually not. The nodule shrinks gradually over months, which often eases symptoms, but some tissue usually remains and regrowth is possible.
Do I need a biopsy before ablation?
Yes. Guidelines advise confirming that the nodule is benign, usually with FNAC, often done twice.
Will I need thyroid tablets after ablation?
Most people do not, because healthy thyroid tissue is preserved. Your doctor will check thyroid blood tests during follow-up.
What is the difference between MWA and RFA?
Both use heat delivered through a needle. RFA uses radiofrequency current and has a longer track record; MWA uses microwave energy and can heat tissue faster. Results are broadly similar in published studies.
Is microwave ablation for thyroid nodules available at THE CLINICS?
Yes. Microwave ablation for thyroid nodules is available at THE CLINICS. Assessment is with Dr Gopal Puri at THE CLINICS Green Park (Monday to Saturday, 6–8 pm), and the procedure is done at THE CLINICS MISC, Hauz Khas. He will advise whether ablation or surgery suits your nodule.
