Pneumonia
Breathing Should Improve Before the Cough Is Gone
General information from an emergency physician. It adds to your discharge papers and does not replace them or your own doctor. What this site is and isn’t
Key Takeaways:
- Pneumonia fills tiny lung air sacs with fluid and infection-fighting cells.
- Fever may end in days, while cough and fatigue can last about two weeks or longer.
- Worsening breathing, confusion, faintness, or inability to drink needs immediate care.
About Your Diagnosis and ED Workup
Pneumonia is an infection in the tiny air sacs of the lung. The immune response fills those sacs with fluid, cells, and debris. This causes cough and makes oxygen exchange harder.
A chest x-ray shows this filling as a cloudy area. The image can stay cloudy after a person feels better because physical cleanup is slower than fever improvement. Routine repeat x-rays add no value when an uncomplicated case is clearly improving.
First Steps and Evidence-Based Home Care
Take the antibiotic exactly as prescribed. Current guidance uses at least 5 total days and requires clinical stability; this page does not change an individual course. Keep drinking and eating as the discharge plan directs. If medicine or fluids will not stay down, return.
Do not use cough alone or a still-cloudy x-ray as proof that treatment failed.
Timeline and Expected Recovery Course
Median recovery is about 3 days for fever, 6 days for shortness of breath, and 14 days for cough and fatigue. Many patients still have at least one symptom at 30 days.
Most patients become clinically stable within 48 to 72 hours. Failure to become stable by day 5 needs evaluation for resistance, a complication, or another diagnosis.
Emergency Red Flags: Return Immediately
Return to the emergency department for worsening or fast breathing, falling oxygen, new confusion, unusual sleepiness, inability to keep fluids or medicine down, persistent high fever by day 5, low blood pressure, or feeling faint when standing.
This list does not cover everything. Return if you are getting worse or seriously concerned.
Reviewed September 3, 2026