Asthma Flare-Up: Recognising It & Getting Help Online (UK)
Educational information — not medical advice.
This article was prepared by the OnlineDoctor24 editorial team and reviewed for factual accuracy against UK clinical guidance (NHS and NICE). It is not written by a doctor and does not replace personal medical advice. For symptoms specific to you, book an online doctor consultation.
Key points
- Asthma flare-ups can develop over hours or days. Early action prevents emergencies.
- Use your reliever (blue) inhaler. If you need it more than every 4 hours or it isn't lasting, seek help.
- Call 999 for severe breathlessness, blue lips, inability to talk in full sentences or no relief from your inhaler.
- Online GPs can prescribe rescue treatment, oral steroids in selected cases, and arrange follow-up.
- Annual asthma reviews are essential — your online GP can do this by video.
Recognising an asthma flare-up
- Increased breathlessness, wheeze or chest tightness
- Cough, especially at night or early morning
- Needing your reliever inhaler more often than usual
- Peak flow falling below your personal best
- Feeling that your usual treatment isn't controlling symptoms
What to do straight away
- Sit upright — do not lie down.
- Take your reliever inhaler (usually salbutamol/Ventolin) — 1 puff every 30–60 seconds, up to 10 puffs, ideally through a spacer.
- If symptoms improve and you feel better, contact your GP within the day for review.
- If symptoms do not improve, or come back within 4 hours, call 999.
Red flags — call 999
- Too breathless to speak in full sentences
- Blue lips or fingertips
- Drowsiness, confusion or exhaustion
- Reliever inhaler not helping
- Peak flow less than 50% of best
How an online doctor can help
For mild to moderate flare-ups, an online GP can:
- Issue a private prescription for a reliever or preventer inhaler.
- Prescribe a short course of oral steroids (prednisolone) where clinically appropriate.
- Review your inhaler technique on video.
- Update or create a personalised asthma action plan.
- Arrange in-person review or A&E attendance if needed.
Preventing future flare-ups
- Take your preventer (usually brown) inhaler every day, even when well.
- Avoid known triggers — pollen, smoke, cold air, pet dander.
- Have your inhaler technique checked annually.
- Keep an asthma action plan and share it with family.
- Get your annual flu vaccine.
Red flags — when to seek urgent help
Call 999 or go to A&E if you experience any of the following:
- Cannot speak in full sentences
- Blue lips or fingertips
- Reliever inhaler not working
- Drowsiness or exhaustion
- Peak flow under 50% of personal best
Frequently asked questions
Common questions UK patients ask about asthma exacerbation.
How an online doctor can help
Related articles
Sore Throat: Symptoms, Causes & When to See an Online Doctor in the UK
Sore throat in the UK? Learn the causes, home remedies, when antibiotics help, and when to see an online doctor for same-day diagnosis and prescriptions.
Persistent Cough: Causes, Treatment & When to See an Online Doctor (UK)
Cough that won't go away? Learn causes (post-viral, asthma, reflux), home remedies, red flags and when to book an online GP in the UK for diagnosis and prescription.
Sinusitis (Sinus Infection): Symptoms, Treatment & UK Online Doctor
Blocked sinuses, facial pain or pressure? Learn how UK GPs diagnose and treat sinusitis, when antibiotics help, and how to see an online doctor today.
This article is for general information only and does not replace personal medical advice from a qualified doctor. Content is reviewed against UK NHS and NICE guidance by the OnlineDoctor24 editorial team and is not authored by a medical doctor. If your symptoms worsen or you are unsure, please book a consultation with a GMC-registered GP.
See a UK GP about this today
Same-day video or phone consultations with GMC-registered GPs. Prescriptions, sick notes and referrals when clinically appropriate.