Insulin pump therapy (Continuous subcutaneous insulin infusion (insulin pump))
A small device that delivers insulin continuously through a tiny tube under the skin, instead of multiple daily injections.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- An insulin pump delivers insulin continuously under the skin instead of injections, and many now pair with a glucose sensor.
- A hybrid closed loop adjusts background insulin automatically, but you still count carbs and announce meals and exercise, so it is not fully automatic.
- It can improve control and reduce disabling hypos for the right person, but it needs training, engagement and a backup injection plan.
- On the NHS it is offered for type 1 diabetes when criteria are met, such as a raised HbA1c or disabling hypos despite good effort, with specialist team support.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Can improve overall glucose control (HbA1c) for the right person
Insulin pumps are mainly for type 1 diabetes; they are not routinely funded for type 2 diabetes.
You start using the pump with close team support, learning to insert the cannula, give doses and respond to readings. Settings are adjusted frequently.
A named specialist diabetes team and an out-of-hours route for pump and glucose emergencies.
You start using the pump with close team support, learning to insert the cannula, give doses and respond to...
Glucose patterns are reviewed and background rates and ratios fine-tuned. You build confidence with carbohydrate...
Control often improves and hypos may reduce as settings settle. If you have a hybrid closed loop, you learn how it...
Regular reviews of glucose data, HbA1c, sites and settings. The cannula site is changed every 2-3 days throughout.
What is insulin pump therapy?
An insulin pump is a small device that delivers fast-acting insulin continuously through a thin tube (cannula) sitting just under the skin, changed every couple of days. It replaces multiple daily injections. You still tell the pump how much carbohydrate you eat and your glucose readings, and it delivers a steady background (basal) rate plus doses (boluses) for meals and corrections.
Many pumps now work with a continuous glucose monitor. In a hybrid closed loop (sometimes called an artificial pancreas), software automatically adjusts the background insulin based on glucose readings, though you still announce meals and exercise. It is hybrid, not fully automatic, so it does not remove the need for your input.
Insulin pumps are mainly used for type 1 diabetes. They can improve glucose control and reduce disabling low blood sugars (hypos) for the right person, but they are a tool, not a cure, and they need active engagement, training and ongoing support to work well.
A pump does not manage diabetes by itself. It can fail or its cannula can block, and because it uses only fast-acting insulin, a pump problem can lead to high glucose and ketones quickly, so you always need a backup plan with injections.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Pump versus multiple daily injections
| Feature | Insulin pump | Daily injections |
|---|---|---|
| Insulin delivery | Continuous, fine adjustments | Several injections a day |
| Hypo flexibility | Can fine-tune and (closed loop) auto-adjust | Less flexible |
| Backup if device fails | Always need injection plan | Not device-dependent |
A pump suits some people very well but adds device management; injections remain a good option and the backup whenever a pump fails.
Preparing for your treatment
- Expect a careful assessment of whether a pump is right for you, including whether you are getting the most from injections and glucose monitoring first.
- Be ready to commit to structured education, carbohydrate counting and frequent glucose checks; a pump works best with active engagement.
- Discuss which pump and whether a hybrid closed loop is suitable, and how it pairs with a glucose sensor.
- Plan for training sessions and close contact with the diabetes team in the first weeks.
- Agree a backup plan with insulin pens or syringes for if the pump fails, including sick-day rules.
- Talk about skin care and where to place the cannula and sensor, rotating sites to protect the skin.
- Ask how the pump fits with work, exercise, driving rules and travel.
What happens
Insulin pump therapy is set up and supported through a specialist diabetes team, not in a single appointment. After confirming you meet the criteria and are getting the most from injections and glucose monitoring, the team helps you choose a pump and arranges structured training.
You learn to insert the cannula just under the skin, programme background rates, give meal and correction doses, and respond to glucose readings. If you have a hybrid closed loop, you learn how the automation works and what it still needs from you, such as announcing meals and exercise. You change the cannula site every two to three days.
In the first weeks, settings are adjusted frequently based on your glucose patterns, often with close contact with the team. Over time, the aim is steadier glucose, fewer hypos and less day-to-day burden, though you remain in charge of carbohydrate counting and decisions.
Throughout, you keep a backup of injections and know your sick-day rules, because a pump uses only fast-acting insulin and a blockage or failure can raise glucose and ketones quickly.
Is this treatment right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Insulin pumps are mainly for type 1 diabetes; they are not routinely funded for type 2 diabetes.
- A pump is not suitable for someone unable or unwilling to engage with carbohydrate counting, frequent glucose checks and device management.
- It is not a cure and will not fix glucose control on its own without education and engagement.
- It may not help, and could add risk, if there is no reliable backup plan or access to specialist support.
Delay or rearrange if…
- You have not yet had structured education or are not getting the most from injections and glucose monitoring.
- There is no specialist diabetes team able to provide training and ongoing support.
- A backup injection plan and sick-day rules are not in place.
- An active site infection or skin problem needs treating first.
Alternatives to discuss
- Multiple daily injections with carbohydrate counting, which remain a good option for many.
- Multiple daily injections plus a continuous glucose monitor without a pump.
- Structured education programmes to improve injection-based control first.
- Returning to injections if a pump does not suit you.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Can improve overall glucose control (HbA1c) for the right person
- Can reduce frequent or disabling low blood sugars (hypos)
- Allows finer, more flexible insulin adjustment around meals, exercise and routine
- Hybrid closed loop can reduce the day-to-day mental load of managing glucose
- Replaces multiple daily injections with a cannula change every few days
Risks & complications
- Skin irritation, soreness or itch at the cannula or sensor site
- The learning curve and the burden of managing a device, alarms and supplies
- Cannula kinking or coming out, interrupting insulin delivery
- Wearing a visible device and dealing with alarms, including at night
- High glucose and ketones developing quickly if insulin delivery stops, because only fast-acting insulin is used
- Site infection needing treatment
- Over-reliance on automation leading to missed problems if you stop checking
- Difficulty getting the settings right, with glucose swings during fine-tuning
- Diabetic ketoacidosis (DKA), a dangerous build-up of ketones, if a pump failure is not acted on
- Severe site infection or abscess
- Device malfunction delivering too much or too little insulin
The most important risk is that a pump uses only fast-acting insulin, so if delivery stops, from a blocked or dislodged cannula, an empty reservoir or a fault, glucose and ketones can rise fast and lead to diabetic ketoacidosis. This is why a backup injection plan and sick-day rules are essential. Ask the team how to recognise and respond to unexplained high glucose, how to check for ketones, and who to contact urgently. A pump only helps if you stay engaged with carbohydrate counting and glucose checks.
Published figures to discuss
How well a pump works varies a lot with the individual, their engagement, education and team support, so average figures do not predict your result. Benefits such as improved HbA1c and fewer hypos are seen in trials and services for the right people, but are not guaranteed. Because device-related events depend heavily on use and setup, we describe key risks qualitatively rather than quoting precise rates.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Diabetic ketoacidosis from insulin interruption | Clinically important because pumps use rapid-acting insulin only | Cannula failure, empty reservoirs or delivery blockage can cause ketones quickly. Patients need sick-day and ketone rules. | NHS England - Hybrid closed loop technologyengland.nhs.ukSource-linked context |
| Hypoglycaemia | Recognised, especially during setting changes or exercise | Basal rates, carbohydrate ratios and correction factors need education and review. | Guide sourcesClinical context |
| Skin infection, lipohypertrophy or site failure | Common practical problem | Site rotation and prompt change of painful, red or leaking cannula sites matter. | NHS England - Hybrid closed loop technologyengland.nhs.ukSource-linked context |
| Hybrid closed-loop benefit | NICE recommends HCL for eligible type 1 diabetes groups through phased NHS rollout | Closed-loop still needs meal announcements, exercise planning, troubleshooting and backup insulin. | NHS England - Hybrid closed loop technologyengland.nhs.ukSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
Here, recovery means how your glucose control responds and how you adapt to the device, rather than physical healing. Many people see benefits over weeks to months as settings are fine-tuned, with the most intensive support at the start.
- Frequent setting changes and close team contact in the first weeks
- Some glucose swings while background rates and meal ratios are fine-tuned
- Getting used to wearing a device, changing sites and managing alarms
- Improvement in control and hypos building over weeks to months, not instantly
Aftercare
- Change the cannula site every two to three days and rotate sites to protect your skin.
- Check glucose regularly and respond to unexplained highs by considering a pump or site problem.
- Always keep a backup of insulin pens or syringes and know your sick-day rules.
- Carry spare pump supplies, batteries or charger, and fast-acting glucose for hypos.
- Test for ketones if glucose is unexpectedly high and you feel unwell.
- Keep your continuous glucose monitor working if you have one, and act on its alerts.
- Attend reviews and share your glucose data so settings can be optimised.
- Backup insulin pens or syringes and long-acting insulin if advised
- Sick-day rules written down
- Ketone testing strips or meter
- Spare cannulas, reservoirs and pump supplies
- Charger or spare batteries
- Fast-acting glucose for hypos
- Diabetes team and out-of-hours contact numbers
Scars and how they heal
Insulin pump therapy does not cause surgical scars, but repeated cannula and sensor insertions can leave small marks, bruising, or areas of firmness or fat change under the skin if sites are not rotated. Rotating insertion sites and good skin care help keep the skin healthy. Ask the team how to look after your sites.
⚠ Get urgent help if…
- Unexpectedly high glucose that does not come down after a correction, suspect a pump or site problem and consider injecting with a pen
- High glucose with nausea, vomiting, tummy pain, drowsiness or deep breathing, possible diabetic ketoacidosis, seek urgent help
- Moderate or high ketones when glucose is high
- Redness, swelling, pus or increasing pain at a cannula or sensor site, possible infection
- Repeated or severe low blood sugars, or hypos you cannot feel coming
- A pump alarm or fault you cannot resolve, with rising glucose
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
Insulin pump therapy works well when your glucose control improves, disabling hypos reduce, and the day-to-day burden feels more manageable, all while you stay engaged with carbohydrate counting and glucose checks. A hybrid closed loop can also ease the mental load of constant decisions.
A pump does not cure diabetes, guarantee perfect glucose, or remove the need for your input. Results depend heavily on engagement, education and good team support, and a pump is not the right tool for everyone.
An insulin pump is usually a long-term treatment, with the device itself replaced every few years and consumable supplies (cannulas, reservoirs, sensors) used continuously. Settings are reviewed and adjusted over time as your needs, weight, activity and life change. The benefits last while the pump is used well and you remain engaged; if it stops suiting you, returning to injections is always an option.
Related tests, treatments or support
Insulin pump therapy is usually combined with a continuous glucose monitor, and in a hybrid closed loop the two work together. It sits alongside structured diabetes education, carbohydrate counting and regular HbA1c checks. People with diabetes also have regular screening for eyes, kidneys, feet and cardiovascular risk, which continues regardless of how insulin is delivered.
Follow-up & long-term care
After starting a pump you are reviewed frequently at first to fine-tune settings, then at regular intervals to check your glucose data, HbA1c, insertion sites and how the device is working for you. Your specialist team remains your point of contact for problems, and you keep your routine diabetes screening for eyes, kidneys and feet.
- Changing the cannula site every 2-3 days and rotating sites
- Replacing sensors and supplies as needed and keeping the device charged
- Regular review of settings, glucose data and HbA1c with the team
- Keeping a working backup of injections and current sick-day rules
- Replacing the pump device at the end of its lifespan
- Continuing routine diabetes screening (eyes, kidneys, feet)
Repeat, follow-on and what comes next
- Settings are adjusted frequently at first and reviewed over time as your needs change.
- Some people switch pump type or move to a hybrid closed loop as technology and eligibility change.
- Returning to injections is a legitimate option if a pump does not suit you, and is not a failure.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A named specialist diabetes team and an out-of-hours route for pump and glucose emergencies.
- Frequent early review to optimise settings, then regular data and HbA1c reviews.
- Clear, written backup and sick-day plans, and ketone-testing advice.
- Support with site rotation, skin care and continuous glucose monitoring, plus routine diabetes screening.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether the pump is NHS-funded under the criteria or self-funded
- The type of pump (tubed or tubeless) and whether it is a hybrid closed loop
- Ongoing supplies: cannulas, reservoirs and continuous glucose sensors
- Structured education and training time
- Frequency of specialist follow-up while settings are optimised
- Replacement of the device at the end of its lifespan
- Whether you meet NHS criteria, or the full cost if self-funding
- What the pump, training and follow-up include
- Ongoing cost of consumables and sensors
- What happens if the device fails or needs replacing under warranty
- Who provides specialist support and out-of-hours advice
- Whether continuous glucose monitoring is included
- What backup supplies you need to keep
On the NHS? Insulin pumps, including hybrid closed loop systems, are available on the NHS for type 1 diabetes when NICE criteria are met; some people self-pay for choice or speed, but specialist team support is needed either way.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Presenting a pump as a cure or as something that controls diabetes by itself.
- Not stressing the need for a backup injection plan and sick-day rules.
- Underplaying the training, engagement and device burden involved.
- Overstating hybrid closed loop as fully automatic when you still announce meals and exercise.
- Not explaining how quickly high glucose and ketones can develop if delivery stops.
Marketing red flags
- Claims that a pump or closed loop is a cure or removes the need for any input.
- Suggesting it guarantees perfect glucose or eliminates hypos.
- Describing hybrid closed loop as a fully automatic artificial pancreas.
- Selling pumps or sensors without proper education and specialist support.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- Do I meet the criteria for an NHS pump, and would a hybrid closed loop suit me?
- How will a pump fit with my work, exercise, driving and travel?
- What is my backup plan and sick-day routine if the pump fails?
- How do I recognise and respond to high glucose and ketones on a pump?
- How much training and follow-up will I get, especially at the start?
- What happens if the pump does not suit me?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my treatment, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this treatment not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Is an insulin pump an artificial pancreas?
Can I get a pump on the NHS?
Does a pump mean no more injections at all?
Will a pump give me perfect control?
What is the most serious risk?
Can I switch back to injections if I do not like it?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NICE TA943 - Hybrid closed loop systems for type 1 diabetes NICE TA151 - Continuous subcutaneous insulin infusion NHS England - Hybrid closed loop technology NHS - Insulin pumps (type 1 diabetes)
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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