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 trouble breathing, chest pain, fainting, stroke-like symptoms, uncontrolled bleeding, or confusion with severe weakness.
Contact your surgical team promptly for worsening pain, repeated vomiting, trouble eating or drinking, difficulty passing urine, wound opening, new drainage, increasing redness or swelling, or a fever that meets the threshold in your discharge instructions.
Seek urgent medical advice for one-sided calf pain or swelling, new shortness of breath, or symptoms that are worsening quickly.
These symptoms should not wait for a routine follow-up appointment.
And for anyone, someone who:
Every sign above is quoted from the sofidex article on Surgery: what to expect. If you are not sure, err upward — it is always reasonable to be checked.