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Sacral nerve stimulation for bladder or bowel problems

This page is about Sacral Nerve Stimulation (SNS) – it’s the operation your doctors think may help with your bladder or bowel problems

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This operation can help if you have an over-active bladder – this means

  • you need to wee a lot
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  • or you can't always get to the toilet in time
Sacral_neuromodulation_EasyRead_4.png This operation can help if you cannot empty your bladder of wee properly
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This operation can help if you have faecal incontinence – this means

  • you may leak poo after you have finished going for a poo
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  • or you can’t always get to the toilet in time
Sacral_neuromodulation_EasyRead_7.png 7 out of 10 people think the operation is helpful
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You will have 2 operations

The operations will be 2 to 4 weeks apart

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Operation 1

The first operation tests to see if the operation is going to help you

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  • the surgeon and the anaesthetist will go through the plans for your operation
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  • we may give you a pair of special stockings to wear to help stop blood clots
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  • we may give you an injection to thin your blood
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  • we make a tiny cut in your lower back and a second tiny cut in your upper buttock
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  • we put a wire near the nerves - we do this using x-ray to make sure it is in the right place
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  • the wire passes out through the skin at the side of your buttock
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  • we connect this wire to a stimulator box outside your body
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  • the stimulator box sends electrical current to the nerves – you will wear the stimulator box all the time
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  • you will probably be able to go home on the same day as your operation
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Between operation 1 and 2

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  • keep you dressings clean and dry
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  • don't shower or go in the bath
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  • keep yourself clean by using a sponge or flannel
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  • don't take the dressings off
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  • while you are at home, we will be in touch regularly to see how well everything is working
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  • fill in the bladder diary so that we can see if the treatment is helping

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  • if you get
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  • redness, pus or swelling around the operation site
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  • and a high temperature
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  • contact us straight away
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Operation 2

The second operation makes the treatment long term

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  • if the treatment has not worked, we will take out the wire
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  • if the treatment has worked, we put in the permanent stimulator
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  • we may give you antibiotics to reduce the risk of getting an infection
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  • we usually switch on your stimulator after the operation – but sometimes we may wait a few days to do this
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  • when it is switched on you may get a tapping feeling
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  • we will set the stimulator up so that you get the most help without any discomfort
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  • we will show you how to change the stimulator settings yourself – by using a remote control device or your phone
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  • feel free to ask us any questions that you have
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After the operation

  • keep the dressings clean and dry
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  • don’t do any stretching or sport for 6 to 12 weeks – this can make the wires move out of place
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  • the operation is safe, but some people get side effects – the most common ones are
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  • tenderness in your back, ankle or foot

 

 

  • problems with your bowels

 

 

  • infection at the place where we did the operation
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  • you may start the security alarms in shops or at airports – show your SNS card to security staff or turn it off before going through security
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  • your battery may be rechargeable – we will show you how to charge it up
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  • if your battery is not rechargeable, we will replace it when it stops working
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Long term

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  • the benefit you get from the stimulator may wear off after a while and we may need to reprogramme it
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  • if you think you may be pregnant your SNS will need to be switched off – we don’t know how it may affect the unborn baby
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  • don’t play any contact sports, ride horses or do any extreme sport
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  • some people cannot have an MRI scan, but some people can – ask your surgeon if you can have one
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  • if you need any other surgery, tell your surgeon that you have an SNS device, as it may need to be switched off

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Page last updated: 27 November 2025

Review due: 31 October 2027