Pathophysiology of pneumonia nursing

Infection triggers inflammation in the small air sacs where oxygen normally passes into the blood. Swelling and secretions make these spaces less effective, while narrowed airways may make it harder to move air. The immune response can cause [Fever](/symptoms/fever/), [Chills](/symptoms/chills/), tiredness, and a [Cough](/symptoms/cough/); mucus may be yellow, green, or blood-streaked without its colour alone proving the cause. Bacterial, viral, and aspiration-related pneumonia can look different, so assessment matters. COVID-19 and [Influenza](/conditions/influenza/) can lead to pneumonia, and severe infection can affect organs beyond the lungs.

A clinician may check breathing rate, oxygen level, temperature, hydration, and mental alertness, then choose tests or treatment according to the suspected cause. Follow the prescribed plan, rest, drink if able, and use fever or pain medicine only as advised. Nursing care often includes positioning the person upright, encouraging safe fluids and gentle movement, supporting effective coughing, and watching for increasing breathlessness or confusion. Do not stop prescribed medicine because symptoms ease. Learn more about [Pneumonia](/conditions/pneumonia/) and [Coughing Up Phlegm](/symptoms/coughing-up-phlegm/).

Seek emergency care for severe difficulty breathing, blue or grey lips, new confusion, fainting, chest pain with breathing, inability to keep fluids down, or marked drowsiness. A worsening fever, rapidly increasing weakness, or much less urine needs same-day medical advice. Sepsis is a serious response to infection; sudden deterioration should not be managed at home.

What type of pneumonia is suspected, and what tests are needed? How will oxygen, hydration, and response to treatment be monitored? Which activities and fluids are safe? What change in breathing or alertness means I should return urgently?