Postoperative fever is a common condition challenging doctors to find the right diagnosis, because it can be a hallmark of serious underlying conditions. One third of patients develop fever after surgery depending on type of surgery but only a small percentage turn out to be due to infection.
drug fever, infections related to intravenous lines or reaction to blood products
Numerous variants on the same theme may exist: sometimes another W for "Wonder why" may indicate an abscess somewhere in the body or the site of surgery. Of course, this list is not comprehensive: catheter-related sepsis is also frequent, but also easily recognised.
Postoperative fever can also be brought on by the inflammation involved in the surgery itself, and does not always require medical attention.