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Cryotherapy & Ablation — Treating Precancer Without Cutting
Not every abnormal patch on the cervix has to be cut out. Where the lesion is small, sits entirely on the visible surface and shows no sign of invasion, the abnormal cells can simply be destroyed — frozen with a chilled probe, or heated with a warm one — and left for the body to replace with healthy tissue. It takes about five minutes, needs no anaesthetic in most women, and you walk out immediately afterwards. The trade-off is real and worth understanding: ablation leaves nothing for the pathologist to examine, so it is only safe when the whole picture has already been seen. This page explains who ablation suits, who it does not, and what the fortnight afterwards is like.
- No cutting, no stitches — the abnormal cells are destroyed in place and replaced as the cervix heals
- About five minutes — done in the outpatient clinic, usually without any anaesthetic
- Very little effect on the cervix — no tissue is removed, so the obstetric concerns tied to deep excision do not apply
- Strict eligibility rules — the entire lesion must be visible, and invasion and glandular disease must be excluded first
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Destroying the Cells Instead of Removing Them
Every treatment for cervical precancer works on the same principle — get rid of the abnormal cells and let normal cells grow back in their place. There are only two ways of doing it. Excision cuts the abnormal area out and sends it to the laboratory. Ablation destroys it where it sits, using cold or heat, and sends nothing.
Cryotherapy is the cold version. A smooth metal probe shaped to sit against the cervix is chilled by compressed gas expanding inside it, and an ice ball forms in the tissue. The standard technique is two freeze cycles with a thaw in between, because a second freeze on already-damaged tissue extends the destruction more reliably than one long application. The frozen cells die over the following days and slough away, and fresh cells cover the area within about a month.
Thermal ablation — confusingly also called cold coagulation, a historical name for a technique that uses heat — achieves the same end from the opposite direction. The probe is warmed to around 100°C and held against the cervix for twenty to forty-five seconds at a time, overlapping applications until the whole lesion has been covered. It is quicker than cryotherapy, needs no gas cylinder, and has become the more practical option in many clinics for that reason.
Both are outpatient procedures. Neither requires an operating theatre, and neither removes any of the structure of the cervix. What neither can do is tell you what was actually there. That single limitation is what governs every eligibility rule below, and it is why an excision such as a LEEP or LLETZ is preferred wherever there is doubt.
Did You Know? Ablation is central to WHO's strategy for eliminating cervical cancer, not a second-best option. WHO guidelines recommend a screen-and-treat approach in which an eligible woman can be tested and treated with ablation in the same visit — because in settings where women travel long distances, the treatment a woman actually receives matters more than the theoretically ideal one she never returns for. Eligibility criteria exist precisely so that this can be done safely. Sources: WHO Guidelines for Screening and Treatment of Cervical Pre-cancer Lesions; WHO Global Strategy for Cervical Cancer Elimination.
Who Can Have Ablation — and Who Should Not
These are not arbitrary rules. Each one exists because ablation destroys the evidence, so the diagnosis must be certain before the probe touches the cervix.
Suitable
The whole lesion is visible
The abnormal area and the junction where the two cell types meet must both lie on the outer surface of the cervix and be fully in view at colposcopy. If the upper edge disappears into the canal, nothing can confirm what is being left behind.
Suitable
The lesion is small enough to cover
It should occupy well under three quarters of the outer cervix and fit within the reach of the probe. A lesion extending onto the vaginal walls or beyond the probe's edge cannot be treated completely.
Suitable
Low-grade or selected high-grade change
Ablation is most often used for persistent low-grade change and for selected CIN 2 where the criteria are comfortably met. Our guide to CIN 1, CIN 2 and CIN 3 explains why grade changes the answer.
Suitable
Findings that agree with each other
Smear, HPV result and colposcopy impression should all point the same way. Any mismatch is a reason to obtain tissue rather than destroy it.
Not suitable
Any suspicion of invasion
Abnormal vessels, an irregular or raised surface, contact bleeding or an ulcerated area all mean tissue must be examined. Freezing a lesion that is already invasive delays a cancer diagnosis, which is the one outcome the rules exist to prevent.
Not suitable
Glandular abnormality
Adenocarcinoma in situ arises inside the canal, can be patchy, and is not reliably reached by a surface probe. It calls for excision — usually a cone biopsy.
Not suitable
CIN 3, or previously treated disease
High-grade change of the most advanced non-invasive kind, disease that has come back after treatment, and a cervix scarred by earlier surgery are all better served by excision, which both treats and re-examines.
Not suitable
Pregnancy, or an untreated infection
Treatment is deferred during pregnancy unless invasion is genuinely suspected, and an active pelvic infection is cleared before any procedure. Neither is a permanent barrier — both simply change the timing.
If you have been offered ablation, ask which of the criteria your colposcopy confirmed. If you have been refused it, the reason is almost always one of the four on the right — and it is a reason worth hearing in full.
What the Appointment Is Actually Like
Ablation is one of the shortest procedures in gynaecology. Most of the appointment is spent talking; the treatment itself is over quickly.
Getting ready
No fasting, no admission and no companion required, although many women prefer to bring one. The appointment is booked outside your period so the cervix can be seen clearly. Simple pain relief an hour beforehand takes the edge off the cramping. Tell the team if there is any chance you are pregnant.
Positioning and checking
You lie as you would for a smear, a speculum is passed, and the cervix is inspected once more under the colposcope with a dilute acetic acid solution to confirm the lesion is where it was and still fits the criteria. This last check is not a formality; it is the moment a plan is changed if anything looks different.
The treatment
The probe is placed flat against the cervix. With cryotherapy you may feel a spreading cold sensation and period-like cramps; the standard cycle is three minutes of freezing, five minutes of thaw, then three minutes again. With thermal ablation the sensation is warmth and the same cramping, in bursts of under a minute. Neither should be sharply painful. Say so if it is.
Afterwards
The speculum comes out, you are given a pad, and you sit for a few minutes if you feel light-headed. Most women go straight back to work or home. Cramps usually fade within a couple of hours and respond to ordinary painkillers.
The one thing everybody underestimates: the discharge. For two to four weeks after ablation you will have a copious, watery, sometimes pinkish discharge as the treated tissue sloughs and heals — heavy enough that most women need pads daily for a fortnight. It is normal, it is not an infection, and it is the single most common reason women ring the clinic afterwards. Knowing about it in advance is far better than discovering it on day three.
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Colposcopy, ablation and excision are all available in-house at CION's 7 NABH-accredited Hyderabad locations, with a woman doctor available on request and same-week appointments.
Cryotherapy, Thermal Ablation and Excision Compared
Three treatments, one purpose. The differences that matter to you are the anaesthetic, the discharge, and whether you get a pathology report at the end.
| Cryotherapy | Thermal ablation | Loop excision (LEEP / LLETZ) | |
|---|---|---|---|
| How it works | Freezes the abnormal cells | Heats the abnormal cells | Cuts the abnormal area out |
| Time taken | About 11 minutes including the thaw | Two to five minutes | Ten to fifteen minutes |
| Anaesthetic | Usually none | Usually none | Local injection into the cervix |
| Tissue for pathology | None | None | Yes — grade, invasion and margins reported |
| Afterwards | Heavy watery discharge, 2–4 weeks | Watery discharge, 2–3 weeks | Light bleeding then brown discharge, 2–3 weeks |
| Effect on the cervix | No tissue removed | No tissue removed | A shallow rim removed |
| Best suited to | Small, fully visible, low-grade lesions | The same, where speed and simplicity help | High-grade disease, canal involvement, any doubt |
If a treatment decision is being made for something beyond precancer, the modalities and the sequencing are described on our cervical cancer treatment in Hyderabad page, and the condition itself on the cervical cancer overview.
The Four Weeks After Ablation
Healing after ablation is quiet but not invisible. Here is what to plan for.
- Cramping settles within hours. Ordinary pain relief is enough for almost everyone.
- Watery discharge for two to four weeks, heaviest in the first fortnight, sometimes tinged pink. Use pads, change them often, and do not be alarmed by the volume.
- Nothing inside the vagina for four weeks — no intercourse, tampons, menstrual cups, swimming or tub baths — so the healing surface is left alone and infection risk stays low.
- Normal activity immediately. There is no wound to protect, so work, driving, exercise and travel can continue as usual.
- Call the clinic if the discharge becomes offensive-smelling or yellow-green, if you develop a fever, if bleeding becomes heavy and bright red, or if pelvic pain increases rather than fades. Infection after ablation is uncommon and easily treated.
- Your next period may be a little early, late or heavier than usual. It settles by the following cycle.
Because ablation removes no tissue, it does not shorten or weaken the cervix in the way a deep excision can, and it is generally regarded as the treatment with the least effect on a future pregnancy. If you are weighing that up as part of your decision, our page on precancer treatment and future pregnancy sets out the evidence for each option.
Did You Know? Treating the cervix does not remove HPV from the body, which is why guidelines make follow-up testing the real end point of treatment rather than the procedure itself. WHO and NCCN both build post-treatment surveillance around an HPV-based test, because a negative HPV result after treatment predicts a durable cure far better than the appearance of the cervix or cytology alone. After ablation, where there is no pathology report to confirm what was destroyed, that follow-up test carries even more weight. Sources: WHO Guidelines for Screening and Treatment of Cervical Pre-cancer Lesions; NCCN Guidelines for Cervical Cancer Screening.
Follow-Up: The Part That Confirms It Worked
After an excision, the pathology report gives an immediate answer about what was removed and whether the edges were clear. After ablation there is no such report, so the answer comes later, from testing.
The first test
You will be asked to return at around six to twelve months for an HPV test, usually with cytology. A negative HPV result is strongly reassuring and means you can move to longer intervals, though still with closer surveillance than the general population for some years. Attend it even though you feel entirely well — nothing about a treated cervix produces symptoms either way.
If HPV is still detected
This does not mean the treatment failed. The virus can persist in tissue that was never abnormal, and it can clear later. What it does mean is a repeat colposcopy to look at the cervix properly. If a new or persisting lesion is seen, the usual next step is excision rather than a second ablation, precisely because a report is now needed.
Long-term screening
Anyone treated for cervical precancer stays in screening for longer than the standard schedule, often for a decade or more, because the risk of a further abnormality remains slightly higher than average for years. That is not a reason for anxiety; it is a reason to keep the appointments, which are the cheapest and least invasive part of the whole process.
Worth holding on to: being offered ablation is usually good news in itself. It means the lesion was small, fully visible, low grade and free of any feature suggesting invasion — the most favourable version of an abnormal result there is. The treatment is brief, the recovery is uneventful, and the follow-up is a test rather than another procedure.
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Common questions
Cryotherapy & Ablation — Frequently Asked Questions
Does cryotherapy on the cervix hurt?
Most women describe cramping similar to a moderate period, along with an odd spreading cold sensation, rather than pain. The cervix has relatively few pain fibres of the kind that register sharp sensation, which is why the procedure is normally done without any anaesthetic at all. Taking simple pain relief about an hour beforehand makes the cramping easier. The freezing itself is applied in two cycles of roughly three minutes with a thaw in between, so the whole treatment is over in around ten minutes. Some women feel briefly light-headed afterwards and are asked to sit for a few minutes. If anything feels sharp rather than crampy, say so during the procedure.
Why is there so much watery discharge after ablation?
Because the treated cells die and are shed while new tissue grows underneath. That process produces a copious, watery, sometimes pinkish discharge that typically lasts two to four weeks and is heaviest during the first fortnight — many women need a pad every day for two weeks. It is expected, not a sign that anything has gone wrong, and it is the most common reason women call the clinic after treatment. Use sanitary pads rather than tampons, and change them often. What is not normal is discharge that turns yellow-green or foul-smelling, or discharge accompanied by fever or increasing pain, which suggests infection and should be reported.
What is the difference between cryotherapy and thermal ablation?
Only the temperature. Cryotherapy destroys the abnormal cells by freezing them with a probe chilled by expanding compressed gas, applied in two cycles with a thaw in between. Thermal ablation — confusingly also called cold coagulation, an old name for a technique that actually uses heat — destroys the same cells with a probe warmed to about 100 degrees Celsius, held against the cervix for twenty to forty-five seconds at a time. Both are outpatient procedures, both usually need no anaesthetic, and both leave no tissue for the laboratory. Thermal ablation is quicker and needs no gas cylinder, which has made it the more practical choice in many clinics. The eligibility rules are the same for both.
Why was I offered excision instead of freezing?
Almost always because one of the eligibility criteria was not met. The commonest reasons are that the upper edge of the lesion runs into the cervical canal where the colposcope cannot follow it, that the abnormality is high grade, that glandular cells are involved, that the lesion is too large for the probe to cover, that the colposcopy appearance raised a possibility of early invasion, or that the smear and the biopsy disagreed. In each of those situations a specimen is needed, because ablation destroys the very tissue a pathologist would examine. Ask your clinician which criterion applied — it is a specific, answerable question, and the answer is in your colposcopy note.
Do I need follow-up if I feel completely fine after ablation?
Yes, and it is the most important part. Treating the cervix does not remove HPV from the body, and a treated cervix produces no symptoms whether or not the abnormality has cleared — so how you feel tells you nothing. You will normally be asked to return at six to twelve months for an HPV test, usually with cytology. A negative result is strongly reassuring and moves you to longer intervals. If HPV is still detected, the next step is a repeat colposcopy rather than an automatic second procedure. Because ablation produces no pathology report, this test is the only confirmation you will get that the treatment did its job.
Medical disclaimer: This page is general health information, reviewed by a CION oncologist. It is not a diagnosis and cannot replace a colposcopy or a consultation. Whether ablation is safe in your case depends on findings only an examination can establish — please discuss your reports with a doctor rather than relying on any website.