Percutaneous tibial nerve stimulation is a form of neuromodulation used for overactive bladder and for bowel urgency. It works by stimulating the posterior tibial nerve at the ankle, which shares nerve roots with the nerve supply to the bladder and pelvic floor, indirectly modulating the signalling that drives urgency.
It occupies a specific place in treatment: it is for people whose symptoms have not responded sufficiently to bladder retraining and pelvic floor muscle training, and who either cannot tolerate medication, do not want it, or have not been helped by it. It is recognised in NICE guidance as an option for overactive bladder in those circumstances.
It is offered here as part of a wider programme rather than as a stand-alone product — the retraining work continues alongside it, because the combination outperforms either alone.
How it works
The posterior tibial nerve runs down the leg to the inner ankle. It originates from nerve roots in the lower spine — L4 to S3 — which are the same roots that supply the bladder, bowel and pelvic floor.
Stimulating the tibial nerve therefore sends signals into that shared segment of the spinal cord and, from there, influences the reflex pathways controlling bladder filling and urgency. The effect is a dampening of the overactive signalling that produces the sudden, compelling urge.
The important practical point is that it is cumulative. A single session does very little; the effect builds across a course of treatment. Most people notice change somewhere around the sixth session, and the standard course is twelve weekly sessions before assessing the outcome.
What a session involves
A fine needle at the ankle
A very fine needle electrode is inserted just above the inner ankle, near the tibial nerve. It is comparable to an acupuncture needle and most people find insertion barely noticeable.
A surface electrode on the foot
A sticky pad is placed on the sole or heel to complete the circuit. Nothing invasive.
Finding the right response
The current is increased slowly until you get either a fanning or curling of the toes, or a tingling sensation spreading through the sole of the foot. That response confirms the nerve is being stimulated correctly — it is the marker we are looking for.
30 minutes of stimulation
You sit comfortably with your leg supported. You can read or use your phone. The sensation is a mild tingling, not painful.
Weekly, for twelve weeks
The standard protocol. Attending consistently matters — the cumulative effect depends on regular sessions, and gaps reduce the benefit.
Review and maintenance
Outcome is assessed at twelve sessions using your bladder diary and symptom scores. Where it has worked, less frequent maintenance sessions usually keep the benefit, since the effect fades over months without top-ups.
TTNS — the non-invasive version
Transcutaneous tibial nerve stimulation (TTNS) uses surface electrodes on the skin instead of a needle. It stimulates the same nerve, without any needle at all.
It has two significant advantages: it is entirely non-invasive, and it can be done at home with a supplied unit, which removes the weekly travel commitment that makes a twelve-week PTNS course difficult for many people.
The evidence base for TTNS is less extensive than for PTNS, and the effect may be somewhat less consistent. For many patients that trade-off is well worth it — a treatment you can actually complete at home beats a more studied one you cannot attend reliably. Which is more appropriate for you is decided at assessment.
Who PTNS is not suitable for
PTNS is generally well tolerated, but it is not appropriate if you:
- Are pregnant, or trying to conceive
- Have a cardiac pacemaker or implanted defibrillator
- Have a bleeding disorder or are on anticoagulation that makes needling unsafe
- Have peripheral neuropathy affecting the leg, which prevents a reliable nerve response
- Have significant circulatory problems in the foot or leg
- Have active infection or skin breakdown at the ankle site
- Have a nerve-related cause of urgency that needs different management — assessed first
These are checked at assessment before any course is started. If PTNS is not suitable, TTNS or other approaches are usually available.
Realistic expectations
PTNS helps a substantial proportion of people who try it, but not everyone. It is a genuine treatment option rather than a guaranteed solution, and it is right to know that before committing to twelve weeks.
Where it works, the typical result is fewer urgency episodes, longer intervals between toilet visits, fewer leaks and less night-time waking — often described as symptoms becoming manageable rather than disappearing entirely.
The benefit is not permanent. It fades over months without maintenance, so ongoing top-up sessions are usually needed to sustain it. That is a normal feature of the treatment, not a failure of it, and it is worth factoring into the cost.
Because it is delivered as a course, ask for the total cost of the full twelve sessions up front rather than the per-session figure. See prices.
Frequently Asked Questions
What is PTNS?
Percutaneous tibial nerve stimulation is a form of neuromodulation for overactive bladder and bowel urgency. A fine needle electrode placed near the tibial nerve at the ankle delivers mild electrical stimulation for 30 minutes. Because the tibial nerve shares spinal nerve roots with the bladder and pelvic floor, this modulates the reflex signalling that drives urgency.
Does PTNS hurt?
It should not. The needle is very fine, comparable to an acupuncture needle, and most people barely notice insertion. During stimulation you feel a mild tingling in the sole of the foot, or see your toes fan or curl — that response confirms correct placement. The current is adjusted to a comfortable level and can be reduced at any point.
How many PTNS sessions will I need?
The standard course is twelve weekly sessions of 30 minutes each, after which the outcome is reviewed using a bladder diary and symptom scores. Most people who respond begin noticing change around the sixth session. Where it has worked, less frequent maintenance sessions are usually needed afterwards, because the effect fades over months without them.
What is the difference between PTNS and TTNS?
PTNS uses a fine needle electrode placed near the nerve at the ankle and is delivered in clinic. TTNS uses surface electrodes on the skin, is completely non-invasive, and can often be done at home with a supplied unit. TTNS has a smaller evidence base and may be somewhat less consistent, but the ability to complete a course at home makes it the better practical choice for many patients.
Is PTNS available on the NHS?
It is recognised in NICE guidance as an option for overactive bladder where conservative treatment has not worked and the person does not want or cannot tolerate medication. Availability varies considerably between areas and services, so ask your GP or continence service what is provided locally. Waiting times are often the reason people seek it privately.
Should I try PTNS first?
Generally no. Supervised bladder retraining and pelvic floor muscle training are first-line treatment and resolve symptoms for many people without any need for neuromodulation. PTNS is appropriate when those have been tried properly and have not achieved enough. It also works better alongside continued retraining than as a stand-alone treatment.
Clinically reviewed by Jency Sudha, Consultant Pelvic Health Physiotherapist & Biofeedback Specialist — last updated 26 July 2026
The information on this page is for general guidance and does not replace individual clinical assessment. If your symptoms are new, worsening, or accompanied by bleeding, fever or severe pain, contact your GP or NHS 111.
Is PTNS Right for You?
Suitability, contraindications and whether first-line treatment has been fully tried are all assessed before starting a course.
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