Quick answer. Pneumonia is an infection of the lung tissue that fills air sacs with fluid or pus, causing cough (often with phlegm), fever, chills, breathlessness and chest pain that worsens on breathing. In Singapore it is a leading cause of death and hospitalisation, hitting the elderly, very young, and people with chronic heart, lung, kidney, liver or immune conditions hardest. It can be bacterial (often pneumococcus, may need antibiotics) or viral (e.g. influenza, COVID-19). See a doctor for persistent fever or worsening breathlessness; call 995 for severe breathlessness, blue lips, confusion or chest pain. Pneumococcal and yearly flu vaccines under the NAIS help prevent it.
Pneumonia is an infection that inflames the air sacs of one or both lungs, which may fill with fluid or pus. In Singapore it remains one of the most common reasons for hospitalisation and is among the leading causes of death, particularly in older adults. The good news is that many cases are preventable through vaccination and treatable when caught early.
This guide explains how pneumonia feels, who is most at risk, the difference between bacterial and viral pneumonia, when hospital care is needed, and how vaccines under Singapore’s National Adult Immunisation Schedule (NAIS) reduce your risk. It is general information and not a substitute for assessment by a doctor.
At a glance
| Symptom | What it looks like | When to act |
|---|---|---|
| Cough | Often productive with yellow, green or rusty phlegm | See a doctor if it persists with fever or worsens |
| Fever & chills | High temperature, sweating, shaking chills | Seek care if high fever lasts beyond 2-3 days |
| Breathlessness | Feeling short of breath, rapid or laboured breathing | Severe or sudden breathlessness = call 995 |
| Chest pain | Sharp pain that worsens when breathing in or coughing | Get assessed; sudden severe chest pain = 995 |
| Confusion / drowsiness | Especially in older adults, even without high fever | Urgent review; can signal severe infection |
| Blue lips or fingertips | Bluish tinge, very rapid breathing | Medical emergency – call 995 |
What pneumonia is and who is most at risk
Pneumonia occurs when an infection inflames the tiny air sacs (alveoli) in the lungs, reducing how well oxygen passes into the blood. It is more than a chest cold because it involves the lung tissue itself.
Anyone can get pneumonia, but the risk of severe illness is highest in:
- Older adults, especially those aged 65 and above
- Infants and young children
- People with chronic conditions such as COPD, asthma, diabetes, heart disease, kidney or liver disease
- Those with weakened immune systems (e.g. cancer treatment, certain medications)
- Smokers, as smoking damages the lungs’ natural defences
Bacterial vs viral pneumonia
Pneumonia can be caused by bacteria, viruses or (less often) fungi, and treatment differs.
- Bacterial pneumonia is frequently caused by Streptococcus pneumoniae (pneumococcus). It often causes higher fever, productive cough and chest pain, and usually needs antibiotics.
- Viral pneumonia can follow influenza, COVID-19 or other respiratory viruses. Antibiotics do not work against viruses; care is mostly supportive, though antiviral medicines are sometimes used. A viral infection can also lead to a secondary bacterial pneumonia.
Your doctor decides on treatment based on your symptoms, examination and, where needed, a chest X-ray or blood tests. Never self-prescribe leftover antibiotics.
When you need a doctor or hospital
See a doctor promptly if you have a persistent or high fever, a worsening cough with phlegm, chest pain when breathing, or breathlessness that is getting worse.
Call 995 or go to the nearest A&E if there are warning signs of severe pneumonia:
- Severe or rapidly worsening breathlessness
- Blue lips or fingertips
- Confusion, drowsiness or difficulty staying awake
- Chest pain with breathlessness
- A home oximeter reading (SpO2) that stays below 92% at rest
Older adults can become seriously ill with subtle signs, such as new confusion or simply being ‘not themselves’, even without a high fever. Take these seriously.
Prevention: pneumococcal and flu vaccination
Vaccination is one of the most effective ways to reduce pneumonia risk, especially for seniors and people with chronic illness. Two vaccines are most relevant under Singapore’s National Adult Immunisation Schedule (NAIS):
- Pneumococcal vaccine protects against the pneumococcus bacterium. For adults aged 65 and above (and younger adults at higher risk), the options are a single dose of PCV20, or a dose of PCV13 and/or PPSV23. Your doctor will advise the right schedule for you.
- Influenza (flu) vaccine, recommended yearly, lowers the risk of flu and of flu-related pneumonia.
Subsidies are available for eligible Singapore Citizens and Permanent Residents at CHAS GP clinics and polyclinics, and MediSave can be used to offset the cost for recommended vaccinations. Check vaccine.gov.sg for current eligibility.
Recovery and self-care
Recovery time varies with the cause, severity and your overall health. Many people with mild pneumonia improve over 1-2 weeks, but tiredness and a lingering cough can last several weeks longer, particularly in older adults.
- Complete the full course of any prescribed antibiotics, even if you feel better.
- Rest, drink fluids and avoid smoking and second-hand smoke.
- Use simple measures (paracetamol for fever, staying upright) for comfort as advised.
- Attend any follow-up review; a repeat chest X-ray is sometimes recommended.
Return to a doctor if you are not improving after a few days of treatment, or if symptoms worsen.
Recovering at home after pneumonia
Many people with milder pneumonia are treated at home and recover over one to two weeks, though tiredness and a lingering cough can last several weeks longer, especially in older adults. To support your recovery: finish the full course of any prescribed antibiotics even if you feel better; rest and drink fluids; avoid smoking and second-hand smoke; and gradually return to normal activity rather than rushing back. Sitting upright and breathing deeply can help keep the lungs clear. Arrange any follow-up review your doctor recommends, and return sooner if you are not improving after a few days or your symptoms worsen.
Special situations
Pneumonia can behave differently in certain groups. In older adults, the main sign may be new confusion or simply being “not themselves” rather than a high fever, so these changes should always be taken seriously. Young children, pregnant women, and people with chronic heart, lung, kidney, liver or immune conditions are also more vulnerable and may need earlier review or hospital care. Vaccination is particularly worthwhile for these groups; ask your doctor which vaccines are recommended for you and whether MediSave can be used to offset the cost, as it can for eligible recommended vaccinations.
Common questions
How is pneumonia different from bronchitis?
Bronchitis is inflammation of the airways, while pneumonia is an infection of the lung tissue itself and is generally more serious. A doctor may use a chest X-ray to tell them apart.
Can I catch pneumonia from someone else?
The germs that cause pneumonia can spread between people, but not everyone who is exposed develops it. Good hand hygiene, not smoking and staying up to date with recommended vaccines all lower your risk.
Do I always need antibiotics?
No. Antibiotics treat bacterial pneumonia but do not work against viral pneumonia, where care is mainly supportive. Your doctor decides based on your assessment.
Related guides
- Best Respiratory & Lung Clinics in Singapore — our editorial shortlist
- Bronchitis
- Breathlessness
- Lung nodules
Sources
- HealthHub – Pneumococcal Disease
- HealthHub – Pneumococcal Vaccine
- Vaccine.gov.sg – Protect yourself against pneumonia (pneumococcal)
- MOH – New vaccines added to National Adult Immunisation Schedule
- MOH (ask.gov.sg) – When should I seek emergency help?
Related conditions & guides
Related conditions and guides you may find useful:
Part of our Lungs, breathing, allergy & sleep guides · Browse all health topics