Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency help for severe or sudden difficulty breathing, chest pain with sweating or faintness, coughing up more than a small streak of blood, fainting, confusion, blue or grey lips, or uncontrolled bleeding.
And for anyone, someone who:
Contact your surgical team promptly for a fever, worsening redness or drainage from a wound, increasing breathlessness, pain that is not controlled, repeated vomiting, or new swelling in one leg.
Also call if a chest-tube site continues leaking fluid or air after discharge.
And for anyone, someone who:
Routine questions about pathology, activity, wound care, or returning to work can usually wait for normal clinic hours or your scheduled follow-up.
Every sign above is quoted from the sofidex article on Lung surgery. If you are not sure, err upward — it is always reasonable to be checked.