Well-controlled asthma is quiet: reliever needed no more than twice a week, no night waking, no limits on what you do. Anything noisier than that is poor control — and the danger is how normal it can feel. People adapt around their asthma for years, mistaking "managed decline" for "fine", when almost all of it is fixable with a treatment review. Here's the checklist.
The core signs
1. Reaching for the blue inhaler three or more times a week
The single clearest marker. Reliever use is a direct readout of how inflamed and reactive your airways are — needing it often means the underlying inflammation isn't being treated adequately. Getting through canisters quickly is a stronger warning still: high annual reliever use is associated with significantly increased risk of severe attacks. If you always know exactly where your blue inhaler is because you use it that much, that's the sign.
2. Waking at night with cough, wheeze or tightness
Airways naturally narrow slightly in the early hours; inflamed airways narrow enough to wake you. Any night waking from asthma symptoms counts as poor control — even once a week — and night symptoms are one of the stronger predictors of attack risk. A morning-cough habit belongs in this category too.
3. Symptoms limiting what you do
Avoiding stairs, cutting runs short, skipping football, dreading cold-morning walks, needing pre-emptive puffs for everyday activity — adaptation is the tell. Well-treated asthma shouldn't dictate your schedule; if it does, the treatment needs reviewing, not the schedule.
4. Daytime symptoms more than twice a week
Wheeze, chest tightness, breathlessness or persistent cough appearing regularly through normal days — including "just a tickly cough that won't go" — is active asthma, not background noise.
5. Needing oral steroids, urgent appointments or A&E
Any attack requiring steroid tablets, an emergency appointment or hospital care in the past year automatically flags your asthma as higher-risk and your regular treatment as needing review — attacks are lagging indicators of control that was already slipping.
The 30-second self-test
Clinicians often use a version of three questions about the past month (the "Royal College of Physicians' three questions"):
- Have you had difficulty sleeping because of your asthma?
- Have you had your usual asthma symptoms during the day?
- Has your asthma interfered with your usual activities?
Any "yes" suggests your control deserves a review. Three yeses means book it this week.
Why control slips — the usual suspects
- Preventer adherence — the most common cause by far; symptom-free spells convince people to stop, and inflammation quietly rebuilds (see reliever vs preventer)
- Inhaler technique — errors are extremely common and mimic treatment failure (see how to use an inhaler properly)
- New or seasonal triggers — pollen seasons, a new pet, damp housing, workplace exposures, smoke
- Infections — colds and flu commonly destabilise control for weeks
- Untreated companions — hay fever and reflux both worsen asthma and both are treatable
- Genuinely insufficient treatment — sometimes the current step just isn't enough, and stepping up (dose, or a combination/MART approach) is the answer
What to do with a "poor control" result
Don't just refill the blue inhaler — that treats the readout, not the problem. Book an asthma review (GP surgery, asthma nurse, or prescriber consultation), bring your inhalers for a technique check, be honest about preventer use, and ask for a written asthma action plan if you don't have one — people with action plans have measurably better outcomes. Reviews are also exactly where treatment gets modernised; if you're still on a setup from years ago, current options may control you better on the same or less medicine.
And know the emergency line: if your reliever isn't lasting four hours, or isn't helping at all during an attack, that's not "poor control" — that's an emergency. Follow your action plan and call 999. Our guide on what to do in an asthma attack covers it step by step.
Frequently asked questions
How many times a week should I need my blue inhaler?
Twice a week or less (excluding pre-exercise doses if prescribed that way). Three or more times a week signals uncontrolled inflammation and warrants a review.
Is waking up coughing at night a sign of asthma trouble?
Yes — night symptoms are among the strongest markers of poor control and elevated attack risk. Even occasional night waking is worth reporting at review.
Can my asthma get worse without me noticing?
Very easily — deterioration is gradual and people adapt around it. The three-questions self-test exists precisely because "feels normal" and "well controlled" often aren't the same thing.
What will actually change at an asthma review?
Typically: technique check, adherence conversation, trigger review, possible treatment step-up or switch (including combination/MART options), and a written action plan. It's a 15–20 minute appointment that prevents attacks.
References
- NICE/BTS/SIGN. Asthma: diagnosis, monitoring and chronic asthma management (NG245).
- Pearson MG, Bucknall CE (eds). Measuring clinical outcome in asthma: a patient-focused approach (RCP three questions). Royal College of Physicians.
- Royal College of Physicians. Why asthma still kills: National Review of Asthma Deaths. 2014.
- Asthma + Lung UK. Asthma action plans. asthmaandlung.org.uk.