Common causes of fever during the days or weeks after surgery include the so-called "six Ws": W ound infections W ater (eg, UTIs) W ind (eg, atelectasis, pneumonia) W alking (eg, DVTs) W onder drugs (eg, drug-induced fever) W idgets (eg, implantable devices, drains) Optimal postoperative care (eg, early ambulation and removal of bladder catheters, meticulous wound and drain care) can decrease risk of DVTs, UTIs, and wound infections.