Asthma

What Happens in Asthma?

The breathing tubes become sensitive and inflamed. At certain times the muscles around them tighten and the inner lining swells, sometimes with extra mucus. This narrows the space through which air moves.

Unlike fixed narrowing, asthma airflow limitation can improve or worsen over minutes, hours, days or seasons. This variability is one of the most useful diagnostic clues. Some people are completely well between episodes.

Common Symptoms and Patterns

• A whistling sound when breathing, especially when breathing out.
• Episodes of breathlessness or a feeling that it is hard to get air through the chest.
• Chest tightness that comes and goes.
• Dry cough or recurrent cough, sometimes without obvious wheeze.
• Symptoms that disturb sleep or are worse on waking.
• Symptoms during exercise, laughter, cold air, respiratory infections or exposure to an irritant.

What Can Trigger Symptoms?

A trigger brings out symptoms in sensitive airways; it is not necessarily the original cause of asthma. Common triggers differ greatly between patients and may include:

• Viral respiratory infections.
• House-dust mites, pollen, mould, animals or other allergens in a sensitised person.
• Tobacco smoke, cooking smoke, incense, strong fragrances, fumes or air pollution.
• Exercise, cold air, laughter or strong emotion.
• Workplace dusts, chemicals, sprays, flour, wood or other occupational exposures.
• Changes in weather or seasons.

The aim is not to create an impossible “trigger-free” life. A careful history identifies exposures that are consistent, important and realistically modifiable.

How Is Asthma Diagnosed?

The clinician first asks whether symptoms vary over time and whether they follow typical patterns. The examination may be normal when the patient is well. Whenever practical, the diagnosis is confirmed with objective testing rather than symptoms alone.

It is often easier to demonstrate variability before long-term prescribed treatment has changed the test pattern. However, do not stop prescribed treatment for testing unless the clinical team gives exact instructions.

Breathing and Inflammation Tests

Can One Normal Test Exclude Asthma?

No. Asthma varies, so spirometry can be normal between episodes. If the history strongly suggests asthma, the clinician may repeat testing during symptoms, use a peak-flow record or arrange a specialist test.

Equally, a label should not be kept forever without supporting evidence when the history and repeated tests do not fit. Rechecking the diagnosis prevents both undertreatment and unnecessary treatment.

Are X-rays or Scans Usually Needed?

A chest X-ray does not confirm ordinary asthma and is not routinely needed for every patient. It may be used when symptoms are unusual, severe, persistent or suggest pneumonia, a foreign body, structural lung disease, heart disease or another diagnosis.

CT is reserved for selected clinical questions. A normal X-ray does not exclude asthma, and an abnormal image must be interpreted separately from the asthma assessment.

Asthma and COPD Are Not the Same

Some patients have features of both. The clinician should document the individual pattern rather than assuming that all adult wheeze is one condition.

What Does Good Asthma Control Mean?

Control describes the recent impact of asthma and the future risk of attacks. It is different from the label “mild” or “severe.” A patient who feels well today may still have important future risk if attacks have occurred.

• Little or no daytime or night-time disturbance.
• Normal or near-normal activity, including appropriate exercise.
• Little need for the prescribed symptom reliever.
• Stable lung function for that patient.
• Few or no flare-ups, urgent visits or admissions.
• A practical plan that the patient understands and can use correctly.

What Suggests Poor Control?

• Symptoms on several days, repeated night waking or morning tightness.
• Avoiding stairs, sport, work, play or normal household activity.
• Increasing or frequent reliance on the prescribed reliever.
• Repeated unscheduled consultations, emergency visits or attacks.
• Falling peak flow or breathing-test results when these are being monitored.

Before changing a plan, the clinician checks the diagnosis, device technique, whether prescribed care is being taken as agreed, exposure, and other conditions that may be worsening symptoms.

What Is an Asthma Flare-Up?

A flare-up or attack is a worsening of symptoms and airflow beyond the patient’s usual variation. It may develop quickly or over several days. Respiratory infection, smoke exposure, poor control, incorrect device use or interrupted prescribed care can contribute, although sometimes no single trigger is found.

What Does Long-Term Care Include?

• Confirming the diagnosis and documenting objective evidence where possible.
• An individual prescribed controller-and-reliever plan without unsupervised changes.
• Repeated demonstration and checking of inhaler or device technique.
• A written asthma action plan explaining everyday care, worsening symptoms and emergency thresholds.
• Review of tobacco, biomass, workplace and allergy-related exposures.
• Age-appropriate activity, weight, sleep, vaccination and associated health review.
• Scheduled follow-up after diagnosis, plan changes and any significant flare-up.

Why Device Technique Matters

Different devices require different preparation, breathing speed, timing and breath-hold. A prescription cannot work reliably if the treatment does not reach the lungs as intended. Technique should be demonstrated, watched and corrected—not assessed only by asking whether the patient “knows how.”

Children, older adults and anyone with hand weakness, poor coordination or difficulty taking a deep breath may need a different device arrangement. Selection is individual and should be checked during consultation.

Exercise and Asthma

Well-controlled asthma should not automatically prevent exercise or sport. Symptoms only with exertion may reflect asthma, poor overall control, reduced fitness, an upper- airway problem, heart disease or another condition.

Repeated exertional symptoms deserve assessment and a clinician-approved activity plan. Sudden severe symptoms, faintness or chest pain during exercise should not be treated as ordinary asthma without evaluation.

Asthma in Children

Recurrent wheeze in a young child is not always asthma, particularly when it occurs only with viral infections. Diagnosis uses the pattern over time, examination, family and allergy history, response to supervised care and—when the child is old enough—objective breathing tests.

• Ask about night cough, running and play, school absence, feeding and growth.
• Review smoke, dampness, mould, animals and other relevant exposures.
• Ensure every caregiver and the school understand the clinician-written action plan.
• Seek urgent care for marked breathing effort, difficulty speaking or feeding, blue colour, exhaustion or poor response to the emergency plan.

Asthma During Pregnancy

Asthma control should be reviewed during pregnancy. Poorly controlled breathing and severe attacks can affect both mother and baby, so prescribed treatment should not be stopped or changed without medical advice. The asthma, pregnancy and device plan can be coordinated with the obstetric team.

Could Asthma Be Related to Work?

Work-related asthma is considered when symptoms begin after a new job or improve on weekends, holidays or time away from a particular exposure. Bakers, cleaners, health- care workers, painters, woodworkers and several other jobs may involve relevant materials.

Record the job, task, substances and timing carefully. Early occupational assessment matters; do not leave work or make a major employment decision solely from an online checklist.

When Is Specialist or Higher-Centre Referral Appropriate?

• The diagnosis remains uncertain or symptoms and test results do not agree.
• There are severe, life-threatening or repeated attacks.
• Symptoms remain uncontrolled despite confirmed technique and an appropriate supervised plan.
• Occupational asthma, a complex allergy pattern or another uncommon condition is suspected.
• A child has atypical symptoms, poor growth, recurrent pneumonia or diagnostic uncertainty.
• Advanced inflammation testing, specialised treatment assessment or multidisciplinary care is required beyond local capability.

Common Myths