What is an Asthma Flare?
An asthma flare (also known as an asthma exacerbation) happens when the airways become more inflamed and narrow than usual, making it harder to breathe. This often develops over hours or days but can sometimes come on suddenly.
Triggers include viral infections, allergens, cold air, exercise, smoke exposure, or missing regular inhalers.
Asthma flares can be mild or severe. Some can become life-threatening without prompt treatment, so recognising early signs is essential.
What Causes an Asthma Flare?
Common triggers
- Viral infections such as a cold or flu
- Allergens such as dust mites, pollen, mould, or pet dander
- Smoke exposure or air pollution
- Exercise (especially in cold, dry air)
- Strong perfumes, cleaning sprays, or fumes
- Stress or emotional triggers
- Weather changes
Lifestyle and medical factors
- Not using prescribed preventer inhalers regularly
- Incorrect inhaler technique
- Poorly controlled underlying asthma
- Gastro-oesophageal reflux disease (GORD)
What Are the Common Symptoms of an Asthma Flare
You may notice:
- Shortness of breath
- Tight chest
- Wheezing or whistling sound when breathing
- Coughing, often worse at night or early morning
- Reduced tolerance for normal activities
- Needing to use your reliever (blue) inhaler more often
Signs of a more severe flare include:
- Difficulty speaking in full sentences
- Feeling very breathless or exhausted
- Blue lips or fingernails
- Peak flow dropping to the yellow or red zone
- Reliever inhaler not working as well or not lasting long
When to Seek Urgent Medical Help
Call 999 or go to A and E immediately if:
- You are very breathless or struggling to speak
- Your reliever inhaler is not helping
- You have blue lips or face
- You feel faint, drowsy, or confused
- Your peak flow is in the red zone (less than 50 percent of your best)
Seek urgent care (same day) if:
- You need your blue inhaler more than every four hours
- Your symptoms are worsening despite using your reliever
- You have a fever or chest discomfort
- You are unsure whether your flare is getting worse
How is an Asthma Flare Diagnosed?
A GP will diagnose a flare based on your symptoms, medical history, and peak flow measurement.
During an online GP consultation, we can:
- Assess your symptoms and flare severity
- Review your inhaler technique
- Adjust preventer medication if needed
- Prescribe short courses of steroid tablets where appropriate
- Advise whether you need in-person assessment or A and E
You may require an in-person review if:
- Your breathing sounds significantly tight
- Peak flow is low
- Symptoms are severe or worsening
- Pneumonia, infection, or another condition is suspected
Treatment and Management Options
Self-care and Home Management
- Take your reliever inhaler (usually salbutamol) as advised in your asthma action plan
- Sit upright and focus on slow, steady breaths
- Use a spacer with your inhaler if you have one
- Avoid known triggers such as smoke, dust, or cold air
- Drink fluids and rest
- Check your peak flow regularly
- Follow your personalised asthma action plan if you have one
Treatment from a GP
A GP may recommend:
- A short course of steroid tablets
- Increasing your preventer inhaler temporarily
- Reviewing your long-term asthma control
- Checking inhaler technique
- Medication changes if flares are frequent
When Referral is Needed
Referral to an asthma or respiratory specialist may be needed if:
- Flares are frequent
- You have required steroid tablets more than twice in 12 months
- Symptoms remain uncontrolled despite regular preventer medication
- Another diagnosis needs excluding
How Dr.Online UK Can Help
We offer:
- Same-day online GP appointments
- Assessment of flare severity
- Private prescriptions for inhalers or steroid medication where appropriate
- Guidance on self-management at home
- Long-term asthma reviews and action plans
- Referral letters to respiratory specialists
