Pelvic Organ Prolapse · Treatment

Neuromodulation for Overactive Bladder and Pelvic Floor Problems

Neuromodulation treats bladder and bowel control problems by stimulating the nerves that regulate them, through a needle near the ankle (tibial nerve stimulation) or a small implanted device near the sacrum (sacral neuromodulation). It is used for overactive bladder, urge incontinence, urinary retention and fecal incontinence that have not responded to training and medication. Somssi Women's Clinic in Gangnam, Seoul assesses your suitability, optimizes conservative treatment first and coordinates neuromodulation with hospital partners.

Medically reviewed by Dr. Yoon Ho-joo, MD, PhD, OB/GYN specialist, Somssi Women's Clinic · Last updated October 2026

At a glance

Key facts

The essentials, based on how Somssi Women's Clinic performs this procedure or answers this question. Your plan is confirmed at consultation.

• Conditions treated: overactive bladder with urge incontinence, urinary frequency and urgency, non-obstructive urinary retention, fecal incontinence
• Main types: percutaneous tibial nerve stimulation (PTNS) in weekly 30-minute sessions; sacral neuromodulation (SNM) with a test phase followed by an implanted stimulator
• Who qualifies: women whose symptoms persist after bladder training, pelvic floor training and at least one medication trial
• Assessment at the clinic: bladder diary, urine test, pelvic exam and prolapse staging, pelvic ultrasound with residual urine, review of prior treatments
• Where it is done: PTNS and SNM are performed by urology or urogynecology teams at partner hospitals we coordinate with
• Not suitable for: pure stress incontinence, leakage caused by prolapse, infection or bladder outlet obstruction
• Led by: Dr. Yoon Ho-joo, MD, PhD, member of the Korean Society of Urogynecology

What is neuromodulation?

The bladder and bowel are controlled by nerves running from the lower spine. In overactive bladder the bladder muscle contracts at the wrong time, producing urgency, frequency and leakage; in some women the opposite happens and the bladder does not empty. Neuromodulation uses gentle electrical stimulation of these nerves to reset the abnormal signaling. It does not cut, remove or support anything; it changes how the nerves behave.

Two approaches are in common use. Percutaneous tibial nerve stimulation (PTNS) delivers the current through a fine needle placed near the ankle, where the tibial nerve shares its spinal origin with the bladder nerves. Sacral neuromodulation (SNM) places a thin lead next to the sacral nerves at the base of the spine, connected to a small stimulator implanted under the skin of the buttock. Somssi Women's Clinic is a surgical gynecology clinic in Gangnam, Seoul, founded in 2000 and led by Dr. Yoon Ho-joo, MD, PhD. We evaluate bladder and pelvic floor problems, exhaust the simpler treatments first, and coordinate neuromodulation with hospital partners when it is the right next step.

Who is a good candidate?

• You have urgency, frequency (more than eight voids a day) or urge leakage that has persisted despite bladder training and pelvic floor exercises.
• You have tried at least one bladder-calming medication and either it did not work or the side effects (dry mouth, constipation, cognitive effects) were unacceptable.
• You have non-obstructive urinary retention, meaning the bladder does not empty although nothing is blocking it.
• You have fecal incontinence that has not improved with diet, bowel training and pelvic floor therapy.
• Infection, bladder stones, tumors, prolapse and outlet obstruction have been excluded as the cause.

Neuromodulation is not a treatment for stress incontinence (leaking with coughing or exercise), for leakage caused by a prolapse kinking the urethra, or for bladder pain syndromes without urgency. Women with these problems need a different plan; see Urinary Incontinence Treatment.

How Somssi evaluates you for neuromodulation

Confirming the diagnosis

Dr. Yoon reviews a three-day bladder diary, tests the urine for infection and blood, and examines the pelvis for prolapse (POP-Q stage 0 to 4), tissue thinning after menopause and pelvic floor strength. A pelvic ultrasound checks the uterus and ovaries and measures the urine left after voiding. Urodynamic testing or cystoscopy is arranged with a hospital partner when the diagnosis is uncertain or before an implant is considered.

Optimizing conservative treatment first

Guidelines ask that simpler measures be given a fair trial before neuromodulation. We make sure bladder training is done correctly, teach pelvic floor contractions and offer an EMS Kegel device for women who cannot activate the muscles, adjust fluids and caffeine, treat constipation, and prescribe vaginal estrogen after menopause, which often reduces urgency by itself. Medication is prescribed and reviewed after four to six weeks. Many women improve enough at this stage that neuromodulation is not needed.

Choosing between PTNS, SNM and other options

If symptoms persist, we discuss the options openly. PTNS is non-invasive and reversible but needs weekly visits for about 12 weeks and maintenance sessions afterward. SNM involves a test phase of one to several weeks with a temporary lead; if symptoms improve by at least half, a permanent stimulator is implanted in a short procedure. Botulinum toxin injections into the bladder wall are another option for refractory urgency and are repeated every six to twelve months. None of these is performed at the clinic; PTNS, SNM and bladder injections are carried out by urology or urogynecology teams at partner hospitals, and we make the referral, share your evaluation and continue your pelvic floor care.

What the procedures involve

Percutaneous tibial nerve stimulation

A fine needle is placed just above the inner ankle and connected to a stimulator for 30 minutes. Most people feel a tingling in the foot. Sessions are weekly for about 12 weeks, then spaced out if they help. No anesthesia is required, and you drive and work normally afterward.

Sacral neuromodulation

In the test phase a thin lead is placed through the skin next to the third sacral nerve under local anesthesia and connected to an external stimulator worn on a belt. You keep a diary for one to several weeks. If urgency, frequency or retention improves by 50% or more, a permanent stimulator about the size of a large coin is implanted under the skin of the upper buttock in a 30 to 60 minute procedure, usually as day surgery. The device is adjusted with a handheld programmer, and batteries last several years, with rechargeable versions available.

Anesthesia, duration and hospital stay

Assessment and conservative care at the clinic need no anesthesia. PTNS is an outpatient treatment with no anesthesia. SNM test leads are placed under local anesthesia and the permanent implant under local with sedation or general anesthesia at the partner hospital, usually as a day case or an overnight stay according to the hospital's protocol.

Timeline and what to expect

Results and what to expect

In published series, a majority of carefully selected patients report at least a 50% reduction in urgency episodes with either PTNS or SNM, and many regain normal voiding with SNM for retention. Benefit from PTNS fades without maintenance sessions, and SNM devices eventually need battery replacement or occasionally lead revision. Neither cures the underlying condition; they control it. We are candid that results vary, that some women do not respond in the test phase, and that choosing the right candidates is most of the success.

Risks and how they are reduced

• PTNS: minor bruising, discomfort or tingling at the needle site; very low risk overall.
• SNM: pain at the implant site, lead movement or breakage, infection requiring removal, unwanted stimulation sensations and loss of effect over time; reduced by a proper test phase, careful technique and programming.
• Imaging restrictions: some older devices limit MRI scanning; the hospital team explains the specifics of the device used.
• Unnecessary treatment: the biggest avoidable risk is treating a problem that was actually prolapse, infection, stress incontinence or a medication side effect, which is why the evaluation at the clinic comes first.

Why international patients choose Somssi

Overactive bladder is often treated piecemeal. Here you get a full English-language assessment of the bladder and pelvic floor together by an OB/GYN who is a member of the Korean Society of Urogynecology, a serious attempt at conservative treatment, and a coordinated referral if neuromodulation is right for you. The clinic has been registered with the Ministry of Health and Welfare for foreign patients since 2011 and is 100 meters from Gangnam Station Exit 1. Because implanted devices need long-term follow-up, we will also discuss how care can continue with a specialist in your home country. See international patients or contact us. The pelvic floor disorders page describes everything else we assess.

Questions patients ask

Frequently asked questions

Short, honest answers. For anything personal, a consultation is the right place to ask.

See the full FAQ →

Is neuromodulation the same as a pelvic floor EMS device?

No. An EMS Kegel device stimulates the pelvic floor muscles directly to strengthen them and is a conservative treatment we use in the clinic. Neuromodulation stimulates the nerves that control the bladder or bowel to change their signaling, and it is reserved for urgency, retention or fecal incontinence that has not responded to simpler measures.

Does Somssi implant sacral neuromodulation devices?

No. Implants are placed by urology or urogynecology teams at partner hospitals. Our role is to confirm the diagnosis, make sure conservative treatment and medication have been properly tried, coordinate the referral, and continue your pelvic floor care before and after. We tell you honestly whether you are likely to qualify.

How long does it take to know if it works?

With PTNS, benefit is judged after about 12 weekly sessions. With sacral neuromodulation, the test phase of one to several weeks with a diary shows whether symptoms improve by at least half; only then is a permanent device implanted. If the test fails, the lead is simply removed.

Can neuromodulation help if I also have prolapse?

Prolapse should be addressed first, because a dropped uterus or bladder can itself cause frequency and incomplete emptying. Once the prolapse is repaired, remaining urgency can be reassessed. Treating the nerves while the anatomy is still pulling on the bladder gives disappointing results.

Are the effects permanent?

Neuromodulation controls symptoms rather than curing them. PTNS needs maintenance sessions, and an SNM device works only while it is switched on and powered; batteries last several years and are then replaced. Many women use these treatments comfortably for years, but it is a long-term relationship with the device and the team that manages it.

What should I try before considering it?

Bladder training, correctly taught pelvic floor exercises, reducing caffeine and evening fluids, treating constipation, vaginal estrogen after menopause and at least one bladder medication trial. We work through these with you over roughly three months. A surprising number of women improve enough that no further treatment is needed.

Keep reading

Related treatments and guides

• Can Pelvic Organ Prolapse Be Treated Without Surgery? — the conservative measures we try first
• How Do I Know If I Have Pelvic Organ Prolapse? — when bladder symptoms are really prolapse
• Pelvic Organ Prolapse Treatment in Korea for Foreigners: Complete Guide — organizing care from abroad
• Urinary Incontinence Treatment — the full ladder of leakage treatments
• Pelvic Floor Disorders — how the whole pelvic floor is assessed
• Pelvic Organ Prolapse Repair — correcting prolapse before treating urgency
• International patients — support for visitors from abroad

Sources and medical review

• International Continence Society (ICS) — terminology and recommendations on neuromodulation for lower urinary tract dysfunction.
• International Urogynecological Association (IUGA) — patient information on overactive bladder and sacral neuromodulation.
• American College of Obstetricians and Gynecologists (ACOG) — guidance on urinary incontinence and overactive bladder in women.

Next step

A consultation first. A decision only when you are ready.

Tell us what you are experiencing and what you hope to change. Dr. Yoon examines, measures and explains the options, including when no surgery is the right answer. International patients can start with an online consultation before travelling to Seoul.