Cough, sore throat, fever and breathlessness can occur with several respiratory illnesses, and the symptoms often overlap. Knowing the common patterns and when symptoms are worth having assessed can make it easier to decide whether to monitor at home or speak with a GP.
This article covers common acute respiratory illnesses in adults, why symptoms can be difficult to tell apart, and which changes may warrant medical review.
Key Takeaways
- Respiratory illnesses can affect the nose, throat, airways or lungs and commonly cause overlapping symptoms including cough, fever and fatigue.
- Cold, influenza, COVID-19, RSV, bronchitis and pneumonia can share similar symptom patterns, so symptoms alone may not identify the exact cause.
- Persistent, worsening or significant breathing symptoms may need GP assessment rather than waiting for symptoms to resolve on their own.
What Are Respiratory Illnesses?
Respiratory illnesses are conditions that affect parts of the respiratory system, including the nose, throat, airways and lungs. This article mainly covers common acute respiratory infections in adults rather than chronic conditions.
Asthma and COPD are chronic respiratory conditions that may worsen during some respiratory infections. Respiratory infections can sometimes worsen their symptoms, but ongoing management of these conditions is different from treating an acute illness. For broader patient information on respiratory viruses, see Healthdirect Australia’s overview of respiratory viruses.
What Are the Most Common Respiratory Illnesses in Adults?
Common respiratory illnesses in adults range from mild upper respiratory infections to conditions affecting the lower airways or lungs.
| Illness | Typical symptom pattern | Important context |
| Common cold | Runny or blocked nose, sore throat, sneezing, mild cough and fatigue | Usually mild; cough can linger after other symptoms settle |
| Influenza | Fever, body aches, marked fatigue, headache and cough | Often causes more significant systemic symptoms than a cold |
| COVID-19 | Cough, sore throat, fever, fatigue and variable other symptoms | Overlaps considerably with other respiratory viruses |
| RSV | Runny nose, cough, fever and sometimes wheeze | Can cause more significant illness in older or higher-risk adults |
| Acute bronchitis | Persistent cough, sometimes mucus, wheeze or chest discomfort | Usually affects the larger airways |
| Pneumonia | Cough, fever, breathlessness and sometimes chest discomfort | May need medical assessment depending on severity |
These symptom patterns overlap and should not be used to diagnose an illness without clinical assessment.
Why Can Different Respiratory Illnesses Cause Similar Symptoms?
Different respiratory infections often affect similar parts of the nose, throat, airways or lungs, which is why cough, fever, sore throat and fatigue appear across many conditions. Severity varies between people, and age or underlying health conditions can also affect how illness presents.
Symptoms alone do not always reveal the exact cause of a respiratory illness. The overall pattern, duration and clinical context are more informative than any single symptom.
When Should You See a GP for Respiratory Symptoms?
GP review may be appropriate when symptoms are worsening, lasting longer than expected, or affecting normal activities.
Consider booking a GP assessment for ongoing respiratory symptoms if you experience:
- Symptoms that worsen after initially improving
- Breathlessness that affects walking or normal activities
- A cough or fever that persists or is not improving as expectedÂ
- Ongoing or significant fever
- Wheezing or chest tightness
- Difficulty keeping fluids down or signs of dehydration
- Coughing up blood
- A worsening of existing asthma, COPD or heart disease
If respiratory symptoms are persistent, worsening or affecting your usual activities, a GP can assess the pattern and advise whether further testing or treatment may be appropriate.
Who May Need Earlier Medical Advice?
Some people may benefit from seeking medical advice earlier because age or underlying health conditions can affect the risk of complications from respiratory illness.
This may include:
- Older adults
- People with asthma or COPD
- People with heart disease
- People with diabetes or other significant chronic conditions
- People with weakened immune systems
- People who are pregnantÂ
People at higher risk may benefit from seeking medical advice earlier if respiratory symptoms develop or worsen, rather than waiting to see whether symptoms improve on their own. For ongoing care for chronic health conditions, your GP can advise how to manage respiratory episodes alongside an existing condition.
What Can a GP Check for Respiratory Symptoms?
A GP can review how symptoms started, how they have changed, and consider your medical history and risk factors to help guide further assessment.
During the appointment, a GP may:
- Assess the duration and pattern of symptoms
- Review breathing symptoms and fever
- Consider relevant medical history and risk factors
- Examine the chest and breathing where appropriate
- Assess whether an existing condition such as asthma or COPD may have worsened
- Arrange investigations where clinically appropriate, such as a respiratory swab, blood test or chest imaging
Not every respiratory illness needs investigation. The GP’s assessment will guide whether any testing may be useful.
When Do Respiratory Symptoms Need Urgent Care?
Severe or rapidly worsening breathing symptoms may require urgent care rather than waiting for a routine GP appointment.
Seek urgent medical care if there is:
- Severe difficulty breathing or an inability to speak normally because of breathlessness
- Blue, grey or very pale lips or fingernails
- Marked confusion, collapse or reduced responsiveness
- Severe or persistent chest pain
- Rapidly worsening symptoms
Call 000 for a life-threatening emergency.
What Can You Do While Recovering?
Many uncomplicated respiratory illnesses improve with supportive care.
- Rest and allow your body time to recover
- Stay well hydrated with water and clear fluids
- Avoid smoking and smoke exposure during illness
- Follow any medicine directions provided
- Reduce contact with others while symptomatic
Many respiratory illnesses are caused by viruses, so antibiotics are not appropriate for every infection. A GP can assess whether antibiotics or another treatment may be needed based on the clinical picture.
For seasonal prevention advice and tips on protecting respiratory health, read our guide to staying healthy during winter in NSW.
Respiratory Illness Care in Branxton
Adults in Branxton with persistent, worsening or difficult-to-explain respiratory symptoms can speak with a GP about appropriate assessment and next steps. Depending on the clinical picture, this may include symptom management, further testing, follow-up or referral where needed.
You can book a GP appointment to discuss your symptoms and appropriate next steps.
FAQs
Can you tell whether it is a cold, flu, COVID-19 or RSV from symptoms alone?
Usually not with certainty. These respiratory illnesses can produce overlapping symptoms, so clinical context and sometimes testing may be needed to help clarify the cause. A GP can assess the pattern and advise accordingly.
Do respiratory illnesses always need antibiotics?
No. Many common respiratory illnesses are caused by viruses, and antibiotics do not treat viral infections. A GP can assess whether antibiotics or another treatment may be appropriate based on the clinical presentation.
How long can a cough last after a respiratory infection?
A cough can sometimes continue after other symptoms improve, and the duration varies with the illness and the individual. A cough that is persistent, worsening or accompanied by other concerning symptoms should be discussed with a GP.
Can a respiratory infection make asthma or COPD worse?
Yes. Respiratory infections can sometimes trigger worsening symptoms in people with existing chronic lung conditions. People should follow their usual management plan and seek medical advice if symptoms are worsening or not responding as expected.
References and Resources
Healthdirect Australia (2024) Respiratory viruses, Healthdirect website, accessed 2 July 2026.
Healthdirect Australia (2024) Chest infection, Healthdirect website, accessed 2 July 2026.
NSW Health (2024) Respiratory viruses fact sheet, NSW Health website, accessed 2 July 2026.
Australian Centre for Disease Control (2024) Preventing the spread of respiratory viruses, Australian CDC website, accessed 2 July 2026.