Community-acquired pneumonia: a case-based approach

The case: a cough that got worse

A 68-year-old develops a cough over three days, first dry then bringing up green phlegm, along with a fever, shivering, chest pain when breathing in, and growing breathlessness. They feel exhausted and off their food. This picture — a lower respiratory infection with fever and breathlessness — raises the possibility of pneumonia, where part of the lung becomes inflamed and fills with fluid. Unlike a simple cold or a chest infection that stays in the airways, pneumonia affects the lung tissue itself, which is why it can make people so unwell. Age over 65 and any long-term heart or lung condition increase the risk. The clinician's first task is to gauge how ill the person is, check their breathing and oxygen levels, and decide whether home care is safe.

How pneumonia is assessed

A clinician listens to the chest, measures temperature, pulse, breathing rate, blood pressure, and oxygen level with a finger probe, and checks whether the person is confused. In general practice, NHS teams often use a simple scoring approach (sometimes called CRB-65) that considers confusion, breathing rate, blood pressure, and age to judge severity and where treatment should happen. A chest X-ray can confirm pneumonia but is not always needed for milder cases managed at home. Blood tests may be used in hospital. The key questions are how well the person is breathing, whether their oxygen is low, and whether they can eat, drink, and cope at home. Most people with mild pneumonia recover at home; those who are more unwell, very short of breath, or have low oxygen need hospital assessment.

Treatment and recovery

Pneumonia caused by bacteria is usually treated with antibiotics, prescribed by a clinician after assessing the person; the choice depends on how unwell they are and local guidance, and this article names no doses. Rest, plenty of fluids, and simple pain relief for fever and chest discomfort all help. It is normal to feel wiped out and to have a lingering cough for weeks after the infection clears. Recovery can be slow: many people feel much better within a week or two, but full energy may take a month or more, and tiredness can persist longer in older people. Smoking makes recovery harder, so stopping helps the lungs heal. Anyone who is not improving after a few days of treatment, or who gets worse, should seek medical review promptly rather than waiting.

Warning signs that need urgent help

Some features mean a person is becoming dangerously unwell and needs emergency care. Phone 999 or go to A&E if someone is struggling to breathe or gasping, has blue or grey lips, face, or fingertips, becomes suddenly confused or drowsy, collapses, or has chest pain that is severe. Rapid breathing, being unable to speak in full sentences, or a very high or falling temperature with shivering are also serious signs. In babies and young children, watch for fast or laboured breathing, the skin between the ribs sucking in, grunting, poor feeding, or unusual floppiness. Older people may become confused or simply go off their feet without an obvious high fever. When in doubt about breathing, treat it as urgent — it is always better to be checked than to wait.

Prevention and who is most at risk

Some groups are more likely to catch pneumonia or become seriously ill, including people over 65, babies, smokers, and those with long-term conditions such as diabetes, heart, liver, kidney, or lung disease, or a weakened immune system. The NHS offers vaccines that lower the risk, including the pneumococcal vaccine for eligible groups and the annual flu vaccine, as flu can lead on to pneumonia; the COVID-19 vaccine is offered to those eligible too. Not smoking, good hand hygiene, and keeping vaccinations up to date all help protect the lungs. People in higher-risk groups should seek advice early if they develop a chest infection that is not settling. Looking after general health, staying active, and treating other conditions well all reduce the chance of a serious chest infection.