Chest Infection Symptoms: When to See a Doctor
Chest infections range from a stubborn post-cold cough to serious pneumonia. Here's how to read your symptoms, when a GP review makes sense, and the red flags that mean it's time for urgent care.
Book an online GP appointmentA chest infection is an infection of the lungs or airways — the two most common forms are acute bronchitis and pneumonia. Most chest infections in Australia are caused by viruses and clear up on their own within a few weeks, but some need antibiotics, and some need urgent emergency care.
Knowing the difference between symptoms you can manage at home and symptoms that need a doctor can help you recover faster and avoid complications. This guide covers the common symptoms of a chest infection, how long it typically lasts, the red-flag signs that mean you should see a doctor, and how to get help online.
Affects the lower airways
Chest infections involve the lungs and bronchi — unlike a cold, which stays in the nose and throat.
Mostly viral
Most cases follow a cold or flu and improve without antibiotics, which only work on bacteria.
Cough can linger
Other symptoms often settle in 7–10 days, but a post-infection cough can last three weeks or more.
Know the red flags
Severe breathlessness, chest pain or blue lips need emergency care — call 000, not a GP.
What is a chest infection?
A chest infection is an infection of the lower respiratory tract — your lungs and the airways leading into them. It usually develops after a cold or flu, when germs travel down from the nose and throat into the chest. The two main types are:
- Acute bronchitis — inflammation of the larger airways (bronchi). This is the most common chest infection, usually caused by a virus, and it typically does not need antibiotics.
- Pneumonia — infection that spreads into the lung tissue itself (the air sacs). Pneumonia is generally more serious and is more likely to need medical treatment, including antibiotics when it is caused by bacteria.
Because the symptoms overlap, it is not always possible to tell which type you have without a proper assessment. That is why knowing when to see a doctor about a chest infection matters.
Common chest infection symptoms
Chest infection symptoms often start a few days after a cold or flu and can include:
- A persistent cough, which may bring up mucus that is clear, yellow, green or occasionally streaked with blood
- Chest discomfort or soreness, especially after coughing
- Breathlessness or feeling short of breath, particularly with activity
- Wheezing or noisy breathing
- Fever, chills or sweating
- Tiredness and general aching muscles
- Headache and a runny or blocked nose in the early stages
- A sore throat before the cough begins
Many of these symptoms overlap with colds, flu and COVID-19. If you are unsure what you are dealing with, see our guide to telling cold, flu and COVID-19 apart.
How long does a chest infection last?
- Most acute bronchitis improves within 7–10 days, although the cough can linger for three weeks or more after the other symptoms settle
- Pneumonia can take longer — many people need several weeks, and sometimes a month or more, to feel fully recovered
- Rest, fluids and simple pain relievers help most mild cases; antibiotics only help if the infection is bacterial
If your cough has lasted more than three to four weeks, or you are not improving as expected, it is worth booking a GP review — a persistent cough can occasionally point to asthma, another underlying condition, or a complication of the original infection.
Bronchitis vs pneumonia: what's the difference?
| Feature | Acute bronchitis | Pneumonia |
|---|---|---|
| What's inflamed | The larger airways (bronchi) | The lung tissue itself |
| Typical cause | Usually a virus | Bacteria, viruses or other germs |
| Cough | Often productive, can last weeks | Persistent, may bring up discoloured mucus |
| Fever | Mild or absent | Often higher, with chills and sweating |
| Breathlessness | Mild | Often more pronounced, even at rest |
| Chest pain | Sore from coughing | Can be sharp, worse when breathing deeply |
| Treatment | Usually supportive care | May need antibiotics and GP review |
This table is a general guide only — the only reliable way to tell the difference is a proper assessment by a doctor, sometimes with a chest examination or imaging.
When to see a doctor
See a GP promptly if you have:
- A cough that has lasted more than three to four weeks
- Coughing up blood or blood-stained mucus
- Chest pain that is new, worsening, or worse when you breathe in
- Repeated bouts of breathlessness or wheezing
- A fever that has lasted more than three days, or keeps returning
- Symptoms that are not improving after a week, or are getting worse
- An existing lung condition such as asthma or COPD that is flaring more than usual
- A weakened immune system, or a long-term condition such as heart or lung disease or diabetes
Children, babies, people over 65, pregnant women and anyone with a chronic health condition should be reviewed earlier rather than later, as chest infections can deteriorate quickly in these groups.
🚨 Call 000 if symptoms are severe
Call triple zero (000) or go to your nearest emergency department if you or someone else has severe difficulty breathing or breathlessness at rest, chest pain that is heavy or spreading to the arm, jaw or back, blue lips or fingertips, coughing up a lot of blood, sudden confusion or extreme drowsiness, or is rapidly getting worse.
These can be signs of a serious lung infection or another cardiac or respiratory emergency. Do not wait for an online appointment — call 000 immediately.
How a telehealth GP can help with a chest infection
Many chest infections can be assessed and managed without leaving home. An online consultation with an AHPRA-registered Australian GP lets you:
- Discuss your symptoms and medical history by video or phone
- Get guidance on whether your infection is likely viral or bacterial
- Receive an electronic prescription (eScript) sent straight to your phone, if medication is appropriate
- Get a pathology referral or imaging referral if your GP wants a chest X-ray or blood tests
- Obtain a medical certificate if you need time off work or study
- Get a specialist referral to a respiratory physician if symptoms need further investigation
GP consultations start from $49, repeat prescriptions and referrals are $25 and medical certificates start from $15 — all with transparent, upfront pricing. See our pricing and fees for details.
How to book an online GP appointment
Book online
Choose a time that suits you and complete a short intake form describing your symptoms.
Speak with an AHPRA-registered GP
A video or phone consultation where the doctor assesses your chest symptoms, history and risk factors.
Get documents and scripts delivered digitally
Prescriptions, referrals and medical certificates are sent directly to your device or pharmacy.
Frequently asked questions
What are the first signs of a chest infection?
Most chest infections begin like a common cold, then the infection moves down into the chest. Early signs include a worsening cough, chest discomfort, breathlessness, wheezing and sometimes fever. If your cold symptoms seem to be "going down into your chest", watch for a cough that becomes productive or breathing that becomes harder.
Can a chest infection go away without antibiotics?
Yes — most chest infections are caused by viruses, and antibiotics do not treat viruses. Most acute bronchitis improves with rest, fluids and simple pain relief. Antibiotics are only appropriate when a doctor suspects a bacterial infection, such as some cases of pneumonia. Never take leftover antibiotics without medical advice.
When should I go to hospital for a chest infection?
Call 000 or go to an emergency department for severe breathlessness or breathlessness at rest, chest pain, blue lips or fingertips, coughing up blood, confusion or extreme drowsiness, or if you are rapidly getting worse. These are emergency symptoms and should not wait for a routine appointment.
How long am I contagious with a chest infection?
If your chest infection is viral, you are generally most contagious in the first few days, similar to a cold or flu. Stay home while you have a fever, cover coughs, wash your hands often and rest until you feel well enough to return to normal activities. Bacterial infections vary, so follow your doctor's advice.
Can I get a medical certificate for a chest infection online?
Yes. If a chest infection is making it unsafe or impractical to work or study, an online GP can assess you and issue a medical certificate during your consultation. NewTeleDoc Medical offers certificates from $15, delivered digitally after your appointment.
Medical review: This article was reviewed by Dr John Youssef, MBBS, FRACGP. Last reviewed: October 2026.
Disclaimer: This article is general information only and is not a substitute for professional medical advice, diagnosis or treatment. Always seek the guidance of a registered health professional about your individual circumstances. In an emergency, call 000.
Worried about a chest infection?
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