Acquired pneumonia: symptoms, care, and warning signs

Bacteria and viruses are frequent causes, but symptoms do not reliably show which germ is responsible. Treatment depends on clinical findings, illness severity, health history, and where the infection developed; antibiotics treat bacterial pneumonia but do not treat viral pneumonia.

The infection inflames the tiny air sacs and may fill them with fluid or inflammatory material, making oxygen transfer less efficient. Pneumonia commonly presents with cough, fever or chills, breathlessness, fatigue, and pain that worsens with a deep breath or cough. Older adults may instead show new confusion or a sudden decline in function.

A clinician may examine breathing, measure oxygen level and temperature, and consider chest imaging or laboratory tests. Identifying the exact organism is not always possible, so the overall clinical picture guides early management.

Seek a medical review if pneumonia is suspected, especially with breathlessness, chest pain, pregnancy, older age, or long-term heart, lung, kidney, or immune conditions. Take prescribed medicine exactly as directed and do not use leftover antibiotics. Rest, drink enough fluid unless fluid restriction has been advised, and avoid smoking or vaping.

Recovery can be gradual. Follow the clinician's plan for review and return sooner if symptoms stop improving or worsen after initial improvement. Limit close contact while feverish or acutely unwell, cover coughs, clean hands, and follow current advice for any identified respiratory virus.

Call emergency services for severe trouble breathing, blue or grey lips or skin, persistent chest pressure, collapse, a seizure, new confusion, inability to wake normally, or rapidly worsening illness. Do not drive yourself if breathing is severely impaired or consciousness is affected.

Get urgent same-day care for increasing breathlessness, inability to keep fluids down, very little urine, coughing blood, or fever and cough that improve then return or worsen. These signs may indicate dehydration, spreading infection, or a complication requiring reassessment.

Ask what findings support pneumonia, whether imaging or infection testing is needed, and what change should trigger urgent review. Confirm how to take each medicine, whether it interacts with your regular treatment, when normal activity can resume, and whether vaccination is appropriate after recovery.