Managing a flare-up of a long-term illness (Management of an acute exacerbation of chronic illness)
The medical treatment given when a long-term condition such as COPD, heart failure or diabetes suddenly gets worse, to settle the flare-up and prevent it happening again.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- A flare-up is when a long-term condition suddenly worsens; treatment settles the episode, treats the trigger and adjusts your usual care.
- It manages the flare but does not cure the underlying condition — preventing the next flare matters as much as treating this one.
- Care ranges from extra medicines at home to a hospital stay, depending on how unwell you are.
- A severe flare can be life-threatening: severe breathlessness, chest pain, confusion or collapse means call 999.
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.
Settles a flare-up more quickly and safely
A planned private appointment is the wrong route for a severe or rapidly worsening flare, which needs 999 or A&E.
The team judges how severe the flare is and starts treatment quickly. Where you are treated depends on how unwell you are.
A clear, written, updated medicines and self-management plan.
The team judges how severe the flare is and starts treatment quickly. Where you are treated depends on how unwell...
As medicines take effect, symptoms such as breathlessness often begin to ease. Tests are repeated to track...
You finish courses such as steroids or antibiotics as directed, and your usual medicines are reviewed and adjusted.
You continue any ongoing treatment, follow your updated self-management plan, and rebuild your usual activity...
What is managing a flare-up of a long-term illness?
This is the medical treatment given when a long-term (chronic) condition suddenly gets worse — known as an acute exacerbation or flare-up. Common examples include chronic obstructive pulmonary disease (COPD), asthma, heart failure, inflammatory bowel disease, and diabetes that becomes unstable.
The aim is to settle the flare quickly, treat anything that triggered it (such as an infection), support the body while it recovers, and then adjust your usual treatment to lower the chance of it happening again. Depending on how unwell you are, this can range from extra medicines at home, through same-day or outpatient care, to a hospital stay.
Managing a flare treats the worsening episode; it does not cure the underlying condition, though good management can improve how you feel and reduce future flares. Working out and tackling the trigger is often as important as treating the symptoms.
A severe flare can be life-threatening. If you have severe breathlessness, chest pain, blue lips, confusion or drowsiness, are struggling to speak, or collapse, call 999 — this is an emergency. For diabetes specifically, very high or very low blood sugar with vomiting, drowsiness or laboured breathing is also a 999 emergency. This guide explains planned and urgent flare management and does not replace personal or emergency medical advice.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Options at a glance
These are the main approaches described in this guide. The right option depends on the diagnosis, your goals and what your clinician thinks is safe.
Treating the trigger
Finding and treating what set off the flare, such as a chest infection, a missed medicine, a new illness or, in heart failure, too much fluid or salt.
Medicines to settle the flare
Condition-specific treatment — for example inhalers or nebulisers and a short course of steroids for COPD or asthma, water tablets (diuretics) for heart-failure fluid, or...
Supportive care
Oxygen if your levels are low, fluids if needed, and monitoring of your breathing, heart, kidneys and blood tests while you recover.
Adjusting your long-term treatment
Reviewing and fine-tuning your usual medicines and self-management plan to reduce the risk of future flares.
Preparing for your treatment
- Bring an up-to-date list of all your medicines, including inhalers, doses and any rescue packs.
- Note when the flare started, what your symptoms are and anything that may have triggered it.
- Bring your usual self-management or rescue plan if you have one.
- Mention recent infections, missed medicines, or changes in weight or swelling.
- Bring recent monitoring readings, such as home blood pressure, weight, peak flow or blood sugar.
- Tell the team about other conditions, allergies and previous hospital admissions.
- Have someone with you if you are very breathless or unwell, and know how you will get home.
What happens
The team assesses how severe the flare is by checking your breathing, oxygen levels, heart rate, blood pressure and how alert you are, and by reviewing your symptoms. This decides whether you can be treated at home, in same-day or outpatient care, or need admission.
They look for a trigger and arrange tests as needed — for example blood tests, an ECG, a chest X-ray, or for breathlessness a blood test (such as NT-proBNP) to help tell a heart cause from a lung cause. Treatment is tailored to the condition and may include inhalers or nebulisers, steroids, antibiotics, water tablets, oxygen and fluids.
You are monitored as the treatment takes effect, with tests repeated to track your recovery and check that treatments such as diuretics are not affecting your kidneys or salts. As you improve, the team reviews your usual medicines, updates your self-management plan, and arranges follow-up. Before you leave, you should understand your new plan and exactly when to seek help.
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…
- A planned private appointment is the wrong route for a severe or rapidly worsening flare, which needs 999 or A&E.
- Treating a flare without identifying the trigger risks it returning quickly.
- Self-managing a severe flare at home beyond your agreed rescue plan is unsafe.
- Flare treatment alone is not enough if the underlying condition is poorly controlled and needs proper long-term review.
Delay or rearrange if…
- There are emergency signs — do not delay, call 999.
- Key information is missing, such as your medicines list or recent results, for a planned review.
- You are between courses of treatment whose effect needs assessing first.
- A new, separate acute problem appears that needs urgent assessment instead.
Alternatives to discuss
- 999 or A&E for a severe flare — the safe default when very unwell.
- NHS GP, specialist nurse or same-day emergency care for milder flares.
- Early self-management using an agreed rescue pack or plan.
- Optimising long-term treatment and vaccinations to prevent flares.
- Rehabilitation programmes such as pulmonary or cardiac rehab.
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
- Settles a flare-up more quickly and safely
- Treats the trigger, such as an infection or fluid overload
- Eases distressing symptoms such as breathlessness
- Reduces the risk of the flare becoming life-threatening
- Improves your usual treatment to lower the chance of future flares
- Gives you a clear plan to act earlier next time
Risks & complications
- Side effects from flare medicines, such as steroids raising blood sugar or causing sleep disturbance
- Discomfort and bruising from blood tests and cannulas
- Tiredness and a slow return to your usual self
- Needing repeated tests and monitoring during treatment
- Water tablets affecting kidney function or blood salts, needing dose changes
- Antibiotic side effects or reactions
- A longer hospital stay than expected if recovery is slow
- The flare not settling fully and needing treatment to be stepped up
- Serious deterioration despite treatment, sometimes needing higher-level or intensive care
- A serious reaction to a medicine
- Complications of being acutely unwell, such as clots or a hospital-acquired infection
The biggest risks come from the flare itself if it is severe or treated late, so early recognition matters. Treatments also carry trade-offs: steroids can unsettle blood sugar and sleep, water tablets can affect the kidneys and salts, and antibiotics have side effects. Ask the team what each treatment is for, how long you will take it, what monitoring you need, and the exact warning signs that mean seek urgent help.
Published figures to discuss
How a flare turns out depends heavily on the condition, its severity, the trigger, how quickly treatment starts and a person's other health problems. Some conditions, such as severe COPD or decompensated heart failure, carry meaningful risks of readmission and deterioration, but published figures vary widely between studies and populations. Because of this, reputable guidance focuses on prompt, tailored treatment and prevention rather than a single risk percentage.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Flare actually caused by infection, clot or heart problem | Common | COPD, heart failure, asthma and kidney disease can worsen because of another acute illness. | NICE NG115 — COPD in over 16s: diagnosis and managementnice.org.ukSource-linked context |
| Steroid, diuretic or antibiotic side effects | Medicine-dependent | Glucose, electrolytes, kidney function, fluid balance and infection risk may need monitoring. | NICE NG115 — COPD in over 16s: diagnosis and managementnice.org.ukSource-linked context |
| Delayed escalation | Safety-critical | Low oxygen, chest pain, confusion, severe breathlessness, reduced urine or collapse need urgent care. | Guide sourcesClinical context |
| No prevention plan after recovery | Common | Inhaler technique, vaccines, action plans, medicines and follow-up reduce future exacerbation risk. | NICE NG115 — COPD in over 16s: diagnosis and managementnice.org.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
Recovery here means how you respond to treatment over the following days and weeks. Many people start to feel better within a few days, but full recovery from a flare varies with the condition, its severity and your overall health.
- Feeling tired and below par for days to weeks after a flare
- Gradual rather than instant improvement in symptoms
- Temporary effects of treatment, such as steroids affecting sleep or blood sugar
- Needing follow-up blood tests after water tablets
- Taking time to rebuild activity and confidence
Aftercare
- Take all prescribed medicines, including full courses of steroids or antibiotics, exactly as directed.
- Follow your updated self-management or rescue plan and keep any rescue pack stocked.
- Attend follow-up blood tests, especially after water tablets, to check kidneys and salts.
- Monitor relevant signs at home, such as weight, swelling, peak flow or blood sugar.
- Treat new infections promptly and keep vaccinations up to date.
- Rebuild activity gradually and consider rehabilitation if offered.
- Know the warning signs that mean seek urgent help, and who to contact.
- Your full, updated medicines list
- Any rescue pack or self-management plan, restocked
- Home monitoring equipment, such as scales, peak flow meter or blood glucose meter
- Follow-up blood test or appointment dates
- Contact details for your GP, specialist nurse or team
- Clear written warning signs and a plan for what to do
- Up-to-date vaccinations where relevant
⚠ Get urgent help if…
- Severe breathlessness, struggling to speak in full sentences, or blue lips — call 999
- Chest pain, especially with sweating or breathlessness — call 999
- New confusion, drowsiness or being hard to wake — call 999
- For diabetes: very high or low blood sugar with vomiting, drowsiness or laboured breathing — call 999
- Coughing up blood, or a lot of frothy or pink phlegm
- Rapidly worsening swelling, sudden weight gain, or being unable to lie flat (heart failure)
- A high fever, shaking chills, or feeling severely unwell
- Your rescue plan is not working or symptoms keep worsening
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
A good outcome is that the flare settles, distressing symptoms ease, any trigger is treated, and you leave with an improved long-term plan and a clear safety net. Many people start to improve within days, though full recovery varies and some flares leave you below your usual level for a while.
Managing a flare does not cure the underlying condition, and it cannot guarantee there will be no further flares. Its real value is treating this episode safely and reducing the risk and impact of the next one through better treatment, monitoring and self-management.
Long-term conditions continue after a flare settles, and further flares can happen, so your treatment plan needs ongoing review. How long you stay well depends on the condition, how well it is controlled, your triggers and your self-management. Each flare is a prompt to revisit medicines, vaccinations, rehabilitation and your rescue plan to reduce future risk.
Related tests, treatments or support
Flare management usually runs alongside investigations to find the trigger and treatment of any infection, and it often leads into longer-term care such as medication optimisation, vaccination, rehabilitation (for example pulmonary rehab after COPD) and self-management education. For some conditions it may also prompt review by a specialist team.
Follow-up & long-term care
Follow-up after a flare checks your recovery, reviews how treatment changes are working, and fine-tunes your long-term plan. It may include blood tests after water tablets, a respiratory or cardiology review, rehabilitation, and updating your self-management plan. Your GP is usually kept informed so your care stays coordinated, with clear advice on when to seek help.
- Take long-term medicines consistently and review them regularly with your team.
- Keep a rescue pack or self-management plan up to date and know how to use it.
- Monitor relevant signs at home and act early on changes.
- Keep vaccinations, such as flu and pneumonia jabs, up to date where advised.
- Engage with rehabilitation programmes if offered.
- Have prompt access to advice when symptoms start to worsen.
Repeat, follow-on and what comes next
- Treatment is often stepped up if the flare does not settle as expected.
- Doses of medicines such as diuretics are commonly adjusted based on blood tests.
- Long-term treatment is frequently changed after a flare to reduce future risk.
- Repeat flares usually mean the prevention plan, not just the acute treatment, needs review.
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 clear, written, updated medicines and self-management plan.
- Defined warning signs and a route to urgent advice.
- Arranged follow-up and any needed monitoring blood tests.
- Onward referral for rehabilitation or specialist review where appropriate.
- A letter to your GP so long-term care stays coordinated.
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:
- How severe the flare is and whether outpatient, same-day or inpatient care is needed.
- The specialist's fee and the length and number of appointments.
- Tests required, such as blood tests, an ECG, a chest X-ray or specialist blood tests.
- Medicines used, including any given in clinic or hospital.
- Monitoring and follow-up blood tests after treatment.
- Rehabilitation programmes and onward specialist referral if needed.
- The specialist's fee and what each appointment covers.
- Which tests are included and which are charged separately.
- Whether medicines given in clinic are included.
- Follow-up appointments and monitoring blood tests.
- Whether a written plan, rescue plan and GP letter are provided.
- What happens, and who is responsible, if you deteriorate or need emergency care.
On the NHS? Flares of long-term conditions are routinely managed on the NHS, including urgent and emergency care; private care may be used for planned review, optimisation or a second opinion, but never as a substitute for emergency care.
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
- Not being told that treatment manages the flare but does not cure the condition.
- Steroid, antibiotic or diuretic risks and monitoring not explained.
- No clear safety-net advice on when to call 999 versus contact the team.
- Leaving without an updated self-management or rescue plan.
- Poor communication with your GP, leaving care fragmented.
Marketing red flags
- Implying private treatment can safely replace emergency care for a severe flare.
- Promising to 'cure' or permanently stop flares of a chronic condition.
- Prescribing steroids or antibiotics routinely without assessing whether they are needed.
- No clear follow-up, monitoring or safety-net plan.
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.
- What triggered this flare, and how can I avoid it next time?
- What is each treatment for, and how long will I take it?
- What monitoring or blood tests do I need during and after treatment?
- How should my usual medicines change after this flare?
- What does my rescue or self-management plan say I should do, and when?
- Which warning signs mean I should call 999 versus contact my team?
- Would rehabilitation, such as pulmonary rehab, help 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 a flare-up an emergency?
Will treatment cure my condition?
Why am I given steroids or antibiotics?
Why do I need blood tests after water tablets?
Can private care help with flares?
How can I avoid the next flare?
Find a verified specialist for managing a flare-up of a long-term illness
Every consultant is GMC-checked and independently reviewed. Search by postcode and distance, or switch to a map. Ordered by rating, relevance and recency — never by who pays.
No verified consultants list this procedure yet — browse the full directory.
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 NG115 — COPD in over 16s: diagnosis and management NICE NG106 — Chronic heart failure in adults NICE CG187 — Acute heart failure: diagnosis and management NHS — Chronic obstructive pulmonary disease (COPD) NHS — Heart failure
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.
Related guides: Diabetic emergency assessment · General medical work-up of complex symptoms · Pleural aspiration / ascitic drain · Ambulatory emergency care · Electrolyte disturbance management