Pneumonia is an infection of the lungs that can be caused by bacteria, viruses or fungi. It can affect people of any age, from infants and children to adults and older people. The severity can range from a relatively mild illness to a life-threatening condition.
During pneumonia, the tiny air sacs in the lungs, called alveoli, can become filled with fluid and inflammatory material. This can make breathing difficult and reduce the amount of oxygen entering the bloodstream.
The important thing to remember is that pneumonia does not always begin with dramatic symptoms. It may start with what looks like an ordinary respiratory infection and gradually become worse.
A persistent cough, fever, increasing tiredness, chest pain or difficulty breathing should not be ignored—particularly when several symptoms occur together.
1. A COUGH THAT BECOMES PERSISTENT
One of the most common symptoms of pneumonia is a cough.
The cough may:
- Become more frequent
- Produce mucus or phlegm
- Become deeper or more painful
- Continue instead of improving
- Become worse over several days
The colour and appearance of mucus can vary, and the presence or absence of phlegm does not by itself determine whether someone has pneumonia.
A cough can occur with many respiratory infections, but a cough that is persistent or getting progressively worse, especially when accompanied by fever or breathing difficulty, should be medically assessed.
2. COUGHING UP PHLEGM
Some people with pneumonia develop a productive cough, meaning they cough up mucus.
The phlegm may be:
- Clear
- White
- Yellow
- Greenish
- Thick
- Occasionally blood-stained
Phlegm can occur with ordinary bronchitis and other respiratory infections as well, so its colour alone cannot diagnose pneumonia.
However, increasing amounts of mucus combined with fever, chest pain or shortness of breath deserve attention.
3. FEVER
Fever is a common symptom of pneumonia.
You may suddenly feel:
- Hot
- Feverish
- Weak
- Sweaty
- Unwell
Fever can occur because the immune system is responding to an infection in the lungs.
WHO lists fever, sweating and shaking chills among the possible symptoms of pneumonia.
However, not everyone with pneumonia develops a high fever. Older adults and people with weakened immune systems may sometimes have less obvious symptoms.
4. CHILLS AND SHIVERING
Pneumonia may cause episodes of chills or shaking.
You may feel extremely cold even though the surrounding environment is warm.
This can occur together with fever and may make you feel:
- Shaky
- Weak
- Cold
- Uncomfortable
- Exhausted
Repeated chills combined with cough and fever should not simply be dismissed as an ordinary cold.
5. SHORTNESS OF BREATH
One of the most important symptoms to watch for is difficulty breathing.
You may notice that you become breathless when:
- Walking
- Climbing stairs
- Doing household activities
- Talking for a long time
- Performing activities that normally feel easy
As pneumonia affects the alveoli and interferes with oxygen exchange, breathing may become increasingly difficult.
Difficulty breathing is a particularly important warning sign.
If breathing becomes difficult even while resting, seek urgent medical attention.
6. RAPID BREATHING
A person with pneumonia may begin breathing faster than normal.
You may notice:
- Rapid chest movements
- Short, shallow breaths
- Breathing faster while resting
- Difficulty completing a full breath
- Increasing effort when breathing
Rapid breathing can be particularly important in children.
WHO uses fast or difficult breathing as an important clinical sign when assessing children with possible pneumonia.
7. CHEST PAIN
Pneumonia can cause chest pain, particularly when inflammation affects tissues surrounding the lungs.
The pain may become worse when you:
- Take a deep breath
- Cough
- Sneeze
- Move your upper body
WHO lists chest pain among the symptoms that may occur with pneumonia.
However, chest pain has many possible causes.
Severe, persistent or unexplained chest pain should always be medically assessed.
8. EXTREME TIREDNESS
Pneumonia can make you feel far more tired than usual.
You may suddenly find ordinary activities exhausting.
For example:
Walking around the house → tiring
Climbing stairs → exhausting
Going to work → difficult
Exercising → impossible
Fatigue is a recognized symptom of pneumonia.
If extreme tiredness occurs together with fever, cough and breathing difficulties, pneumonia should be considered among the possible causes.
9. GENERAL WEAKNESS
You may feel physically weak throughout your body.
You might notice:
- Reduced strength
- Difficulty getting out of bed
- Reduced ability to perform daily activities
- Heavy arms and legs
- Needing more rest than usual
This can occur because your body is using significant energy to fight the infection and because breathing may become more demanding.
10. SWEATING
Some people with pneumonia experience significant sweating, particularly during episodes of fever.
You may:
- Wake up sweaty
- Need to change your clothes
- Experience sweating after chills
- Alternate between feeling hot and cold
Sweating is one of the symptoms listed by WHO in pneumonia.
11. HEADACHE
Headache may occur during pneumonia, particularly when it is accompanied by:
- Fever
- Dehydration
- Fatigue
- Coughing
- General illness
However, headache is nonspecific and can occur with many infections.
A severe or unusual headache accompanied by confusion or neurological symptoms requires urgent assessment.
12. LOSS OF APPETITE
Pneumonia may reduce your appetite.
You may notice:
- Food no longer seems appealing
- You eat much smaller portions
- You skip meals
- You feel weak because you are eating less
Loss of appetite can contribute to weakness and dehydration.
Try to maintain adequate fluid intake unless a healthcare professional has advised you to restrict fluids.
13. NAUSEA AND VOMITING
Pneumonia can sometimes cause gastrointestinal symptoms such as:
- Nausea
- Vomiting
- Stomach discomfort
WHO lists nausea, vomiting and diarrhoea among possible symptoms of pneumonia.
These symptoms can also be caused by many other illnesses, so they should be considered together with respiratory symptoms.
14. DIARRHOEA
Some people with pneumonia experience diarrhoea, particularly when the infection is associated with certain pathogens.
Diarrhoea can also lead to:
- Dehydration
- Weakness
- Dizziness
- Reduced urine output
If diarrhoea is severe or persistent, medical assessment may be necessary.
15. DIZZINESS OR LIGHT-HEADEDNESS
Pneumonia may leave you feeling dizzy or light-headed, particularly if you have:
- Fever
- Dehydration
- Low blood pressure
- Difficulty breathing
- Significant weakness
Sudden severe dizziness, fainting or confusion requires urgent medical attention.
16. CONFUSION OR CHANGES IN ALERTNESS
This symptom is particularly important in older adults.
Instead of developing the classic combination of fever and cough, an older person may primarily show:
- Confusion
- Unusual sleepiness
- Changes in behaviour
- Reduced alertness
- Difficulty communicating normally
WHO specifically identifies confusion, especially in older adults, as a possible symptom of pneumonia.
A sudden change in mental state should never be ignored.
17. BLUE OR GREY LIPS OR FACE
A bluish or greyish colour around the lips, face or skin can indicate that the body may not be receiving enough oxygen.
This is a medical emergency.
It may be accompanied by:
- Severe breathing difficulty
- Rapid breathing
- Extreme weakness
- Confusion
- Drowsiness
Do not wait for this symptom to improve on its own.
18. BREATHING THAT REQUIRES EXTRA EFFORT
A person with serious pneumonia may appear to be working hard to breathe.
You might notice:
- Nostrils widening during breathing
- Chest moving rapidly
- Neck muscles working harder
- Difficulty speaking complete sentences
- Struggling to breathe while resting
In children, lower chest wall indrawing—where the lower chest pulls inward during breathing—is an important sign of severe respiratory illness.
19. SYMPTOMS THAT GET WORSE AFTER A COLD OR FLU
Sometimes pneumonia develops after another respiratory infection.
For example:
Day 1–3:
Sore throat and runny nose.
Day 4–5:
Cough becomes stronger.
Day 5–7:
Fever returns or becomes worse.
Then:
Chest pain, weakness or difficulty breathing develops.
A respiratory illness that initially seems to improve but then becomes significantly worse deserves medical assessment.
20. A COUGH WITH FEVER AND BREATHING DIFFICULTY
One symptom alone does not necessarily indicate pneumonia.
However, the combination of:
COUGH + FEVER + SHORTNESS OF BREATH
is much more concerning than a simple cough alone.
WHO identifies cough and breathing difficulty as important features when assessing pneumonia, particularly in children.
If these symptoms are becoming progressively worse, seek medical advice.
21. PERSISTENT CHEST DISCOMFORT
Some people describe pneumonia-related chest discomfort as:
- Sharp
- Aching
- Tight
- Burning
- Painful when breathing deeply
The exact sensation can vary depending on which structures around the lungs are affected.
Do not assume that persistent chest pain is caused by pneumonia without medical assessment.
22. FEELING UNABLE TO TAKE A DEEP BREATH
You may feel as though:
“I can't fill my lungs completely.”
This sensation can occur when the lungs are inflamed or when breathing becomes painful.
If you are unable to breathe comfortably or are becoming increasingly breathless, this requires prompt medical attention.
23. CHILDREN MAY SHOW DIFFERENT WARNING SIGNS
Pneumonia can look different in children compared with adults.
A child may have:
- Cough
- Fever
- Fast breathing
- Difficulty breathing
- Poor appetite
- Difficulty drinking
- Unusual tiredness
- Irritability
- Chest retractions
WHO notes that in children under five, pneumonia may be identified clinically by cough and/or difficult breathing together with fast breathing or lower chest wall indrawing.
24. BABIES MAY NOT HAVE A CLASSIC COUGH
Very young infants can sometimes show less obvious respiratory symptoms.
Instead, parents may notice:
- Difficulty feeding
- Poor breastfeeding
- Weakness
- Fast breathing
- Difficulty breathing
- Unusual sleepiness
- Reduced interaction
WHO notes that severely ill infants may be unable to feed or drink and may develop unconsciousness, hypothermia or convulsions.
These signs require urgent medical evaluation.
25. OLDER ADULTS MAY HAVE LESS TYPICAL SYMPTOMS
Pneumonia can be particularly dangerous in older adults.
An older person may not always develop a dramatic fever.
Instead, the first noticeable changes may be:
- Confusion
- Weakness
- Reduced appetite
- Extreme tiredness
- Difficulty walking
- Increased sleepiness
- Sudden deterioration in daily functioning
WHO specifically highlights confusion as a possible pneumonia symptom in older adults.
26. WHO IS AT GREATER RISK?
Pneumonia can affect anyone, but the risk of serious illness is higher among certain groups.
These include:
- Babies and young children
- Adults aged 65 and older
- People with weakened immune systems
- People with chronic illnesses
- People with certain respiratory conditions
- People who smoke
- People with poor nutritional status
WHO identifies young children, older adults and people with pre-existing health problems as groups at increased risk.
If you belong to a higher-risk group, do not wait for symptoms to become severe before seeking medical advice.
27. PNEUMONIA CAN BE CAUSED BY DIFFERENT ORGANISMS
Pneumonia is not one single disease caused by one single germ.
It can be caused by:
BACTERIA
Some bacterial infections can cause significant fever, cough and chest symptoms.
VIRUSES
Respiratory viruses can also cause pneumonia.
FUNGI
Fungal pneumonia can occur, particularly in certain people with weakened immune systems.
WHO states that pneumonia is most commonly caused by viruses or bacteria, although fungi can also cause pneumonia.
This is important because treatment depends on the underlying cause.
28. PNEUMONIA IS NOT ALWAYS THE SAME AS A COLD
A cold usually produces symptoms such as:
- Runny nose
- Sneezing
- Sore throat
- Mild cough
Pneumonia can cause more significant symptoms such as:
- Fever
- Persistent cough
- Shortness of breath
- Chest pain
- Severe fatigue
- Rapid breathing
However, there can be considerable overlap.
Therefore, symptoms alone cannot always distinguish pneumonia from other respiratory infections.
29. HOW DO DOCTORS CHECK FOR PNEUMONIA?
A healthcare professional may assess:
- Your symptoms
- Breathing rate
- Oxygen level
- Heart rate
- Temperature
- Lung sounds
- General condition
Depending on the situation, additional investigations may be required.
These may include:
- Chest imaging
- Blood tests
- Sputum testing
- Other laboratory investigations
The exact tests depend on the person's age, symptoms, severity and medical history.
30. WHEN SHOULD YOU SEE A DOCTOR?
You should seek medical advice if you develop:
🫁 PERSISTENT COUGH
Especially if it is getting worse rather than better.
🌡️ FEVER
Especially persistent or high fever.
😮💨 SHORTNESS OF BREATH
Particularly during normal activities or at rest.
❤️ CHEST PAIN
Especially when breathing or coughing.
😴 EXTREME FATIGUE
Especially when it interferes with normal activities.
🤢 PERSISTENT VOMITING
Especially if you cannot maintain adequate fluids.
🧠 CONFUSION
Especially in an older adult.
These are recognized symptoms associated with pneumonia and other serious respiratory illnesses.
🚨 EMERGENCY WARNING SIGNS
Seek immediate medical attention if you or someone else develops:
SEVERE DIFFICULTY BREATHING
The person is struggling to breathe or cannot speak normally because of breathlessness.
BLUE OR GREY LIPS OR FACE
This can indicate inadequate oxygenation.
SEVERE CHEST PAIN
Especially persistent or worsening pain.
CONFUSION OR ALTERED CONSCIOUSNESS
The person becomes confused, extremely sleepy or difficult to wake.
SEIZURES
Particularly in a person without a known seizure disorder.
VERY RAPID OR LABOURED BREATHING
Especially in children.
CDC respiratory-illness guidance identifies fast or difficult breathing, bluish lips or face, chest pain, altered mental status and seizures as emergency warning signs.
HOW PNEUMONIA CAN BECOME SERIOUS
The main concern with severe pneumonia is that inflammation and fluid in the lungs can interfere with normal oxygen exchange.
This may lead to:
Breathing difficulty
↓
Reduced oxygen levels
↓
Increasing weakness and fatigue
↓
Confusion or deterioration
In severe cases, pneumonia can become life-threatening and may require hospital treatment, oxygen therapy and other supportive care.
WHO notes that pneumonia can range from mild to life-threatening illness.
CAN PNEUMONIA BE PREVENTED?
The risk of pneumonia can be reduced through several measures.
VACCINATION
Vaccines can protect against some of the infections that cause pneumonia, including pneumococcal disease, influenza, measles, Hib and pertussis.
HAND HYGIENE
Regular handwashing helps reduce the spread of respiratory infections.
AVOID SMOKING
Smoking damages the respiratory system and can increase vulnerability to respiratory illness.
GOOD NUTRITION
Adequate nutrition supports the body's natural defenses.
GOOD RESPIRATORY HYGIENE
Cover coughs and sneezes and avoid close contact with people who are sick when possible.
WHO recommends vaccination, hand hygiene, reducing indoor air pollution, avoiding smoking and maintaining a healthy lifestyle as ways to reduce pneumonia risk.
A SIMPLE PNEUMONIA WARNING-SIGN CHECKLIST
COMMON SYMPTOMS
🫁 PERSISTENT COUGH
🌡️ FEVER
🥶 CHILLS
💦 SWEATING
😴 FATIGUE
❤️ CHEST PAIN
😮💨 SHORTNESS OF BREATH
🤢 NAUSEA OR VOMITING
🚽 DIARRHOEA
🧠 CONFUSION, ESPECIALLY IN OLDER ADULTS
🚨 SERIOUS WARNING SIGNS
Pay particular attention to:
SEVERE DIFFICULTY BREATHING
VERY RAPID OR LABOURED BREATHING
BLUE OR GREY LIPS OR FACE
SEVERE CHEST PAIN
CONFUSION OR REDUCED ALERTNESS
INABILITY TO DRINK
SEVERE WEAKNESS
SEIZURES
These signs require urgent medical assessment.
FINAL TAKEAWAY
Pneumonia can begin with symptoms that look like an ordinary respiratory infection, but it can become serious when the infection affects the lungs and interferes with breathing.
The key symptoms to watch for are:
PERSISTENT COUGH
FEVER AND CHILLS
SHORTNESS OF BREATH
CHEST PAIN
RAPID OR DIFFICULT BREATHING
EXTREME FATIGUE
SWEATING
NAUSEA, VOMITING OR DIARRHOEA
CONFUSION, PARTICULARLY IN OLDER ADULTS
The most important message is simple:
DON'T IGNORE A COUGH THAT IS GETTING WORSE—ESPECIALLY WHEN IT IS ACCOMPANIED BY FEVER, CHEST PAIN OR DIFFICULTY BREATHING.
Pneumonia is treatable, but the appropriate treatment depends on its cause and severity. Bacterial pneumonia may require antibiotics, while viral pneumonia may require different management.
If breathing becomes difficult, the lips or face become blue or grey, the person becomes confused or difficult to wake, or severe chest pain develops, seek emergency medical care immediately.
Medical disclaimer: This article is intended for general health education and cannot diagnose pneumonia. Cough, fever, chest discomfort and breathing difficulties can have many causes. If symptoms are persistent, severe or worsening, consult a qualified healthcare professional for appropriate examination and treatment.
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