Radiofrequency Ablation & Coblation of the Lingual Tonsils (Tongue Base)

What the Operation Is

The lingual tonsils are pads of lymphoid tissue at the very back of the tongue — part of the same ring of tissue (Waldeyer's ring) that includes the palatine tonsils on the side walls of the throat and the adenoids at the back of the nose. When the lingual tonsils enlarge, they can obstruct the back of the airway during sleep, contributing to snoring and obstructive sleep apnoea. This is particularly common in patients who continue to have OSA despite having had a tonsillectomy (palatine tonsils removed) in childhood, in adults with persistent tongue-base obstruction on drug-induced sleep endoscopy (DISE), and in patients whose imaging or examination shows hypertrophied lingual tonsil tissue.

Two minimally invasive techniques are used to shrink the tissue:

• Radiofrequency ablation (RFA) — a probe is inserted into the lingual tonsil and delivers controlled heat energy that coagulates a small volume of tissue. The treated tissue is gradually broken down and replaced by scar tissue over several months, producing a measurable reduction in tongue base bulk.
• Coblation — uses radiofrequency energy delivered through a saline irrigation field, creating a "plasma" that breaks down tissue at much lower temperatures than traditional cautery. Coblation can be used to ablate small volumes of tissue or to remove tissue completely from the surface.

Both techniques are well-established. The choice between them depends on your individual anatomy, the bulk of the lingual tonsil, and what is found at the time of surgery. I will often combine these procedures with other airway operations during the same anaesthetic.

Video Guides

The videos below explain the operation and its side-effects in more detail.

The Benefits of the Operation

For carefully selected patients — those whose pre-operative assessment confirms tongue-base obstruction as a significant contributor to OSA or snoring — lingual tonsil reduction can meaningfully improve airflow during sleep, reduce snoring, and lower the apnoea-hypopnoea index (AHI). Published series report meaningful AHI reductions in around 60–80% of well-selected patients. The lingual tonsil operation is rarely performed in isolation; it is usually combined with palatal surgery or other tongue-base procedures as part of a tailored multilevel plan.

Risks & Complications

1. Taste change or altered tongue sensation

Some patients notice a temporary change in taste or a mild altered sensation in the tongue after surgery — the taste buds at the back of the tongue and the small nerves in the area can become irritated by the heat or by the post-operative swelling. Most cases settle within a few weeks. If a post-operative infection develops, taste disturbance may take several months to fully recover rather than a few weeks. A feeling of numbness or mild weakness is theoretically possible with operations in this region, although this has not been a feature in my practice.

2. Globus sensation and tongue-base firmness

It is very common to experience a sensation of something sitting in the throat in the weeks following the procedure. The lingual tonsil tissue swells initially before gradually shrinking and being replaced by scar tissue. This feeling typically settles over a few weeks as the inflammation resolves. As healing progresses, some patients notice that the tongue base feels firmer than before — this is entirely normal and simply reflects the scar tissue that has formed. The firmness softens gradually over several months and usually resolves fully within nine months.

3. Pain and difficulty swallowing

Pain and difficulty swallowing are expected in the first one to two weeks and are a normal part of recovery. Pain is usually moderate and can be managed with regular paracetamol and ibuprofen; some patients also benefit from a short course of diclofenac. Temporary changes to the voice or speech can occur as the swelling settles and typically resolve within a few weeks.

4. Bleeding, infection, pain

As with any operation, bleeding, infection and post-operative pain are possible. For this particular operation these risks are generally low. Significant post-operative bleeding from the tongue base is rare but, because of the proximity to the airway, requires urgent assessment — please attend A&E if you notice fresh red bleeding from the mouth.

5. Damage to teeth

There is a very small risk of damage to the teeth, most commonly from the mouth-gag used to keep the mouth open during the procedure. Please tell your surgeon at the consent appointment if you have crowns, caps, veneers, bridges, dentures, or any loose teeth.

6. Anaesthetic risks

As with any operation under general anaesthetic, there are standard risks, which the anaesthetist will discuss with you separately. These remain low overall in fit patients.

7. Need for a second procedure

Occasionally a second procedure may be needed if sufficient tissue was not removed at the first attempt. I quote a risk of around 5% for this. The lingual tonsil is a dynamic structure and conservative surgery (taking less tissue at one stage) is often safer than aggressive surgery (taking too much and risking longer-term swallowing or sensory problems).

Aftercare

• Pain control. Paracetamol 1 g four times daily, ibuprofen 400 mg four times daily, staggered. A short course of oral steroid is usually given at surgery to reduce swelling. Continue the painkiller schedule for the first one to two weeks even if pain is mild.
• Eat normally. Slightly abrasive food is preferred to soft food alone — it keeps the swallowing muscles working and reduces painful muscle spasm at the back of the throat. Avoid very hot or spicy food for the first week.
• Hydration. Drink generously. Cool drinks often feel more comfortable.
• Rest. Plan for one to two weeks off work; avoid strenuous exercise for two weeks.
• Sleep position. Sleeping on the side is usually more comfortable than on the back during recovery.

When to Call the Hospital or Attend A&E

Attend A&E urgently for any of the following:

• Fresh red bleeding from the mouth or throat.
• Worsening pain after the first week.
• Inability to swallow saliva or take fluids.
• Fever above 38.5°C that does not settle.
• Difficulty breathing or noisy breathing not present before surgery.

Booking, Consent and Next Steps

If you are considering this operation, the secretarial team can arrange a consultation, or you can book online. This procedure is usually planned as part of a broader sleep-surgery assessment — see DISE & PTLTbE classification and Snoring & OSA for related reading.