Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for severe breathing difficulty, blue or gray discoloration, collapse, difficulty waking, or severe chest pressure.
Seek urgent assessment for marked worsening, new confusion, significant weakness, reduced urination, or an oxygen level below the plan set by your clinician.
And for anyone, someone who:
Arrange routine follow-up as instructed.
A follow-up visit may review breathing, oxygen needs, medication effects, and return to normal activities.
It can also address vaccination, smoking, swallowing concerns, or control of long-term conditions.
The article also says
Some improvement is usually expected after treatment begins, but recovery is not immediate.
Fever and breathing may improve before the cough, reduced stamina, or fatigue.
These symptoms can take longer to settle, particularly after a severe infection.
Contact the treating clinician if symptoms are not beginning to improve within the timeframe they provided, often within the first few days of treatment.
Earlier review is appropriate if fever returns, breathlessness increases, chest pain worsens, fluids cannot be kept down, or new symptoms develop.
A repeat chest X-ray is not automatically needed after every case.
It may be considered when symptoms persist, recovery is not as expected, the original imaging showed an unusual finding, or there are risk factors for an underlying lung problem.
Return to work, exercise, and other activities gradually.
Trying to resume a full schedule too quickly may increase fatigue.
Ask a clinician for guidance if your work is physically demanding or if you still need oxygen.
Every sign above is quoted from the sofidex article on Community-acquired pneumonia in adults. If you are not sure, err upward — it is always reasonable to be checked.