Causes of Post operative fever:

Remember the following mnemonic when determining the possible cause(s) of fever in a patient who has recently undergone a surgical procedure: the 5 W's

Wind: the pulmonary system is the primary source of fever in the first 48 hours.

Wound: there might be an infection at the surgical site.

Water: check intravenous access site for signs of phlebitis.

Walk: deep venous thrombosis can develop due to pelvic pooling or restricted mobility related to pain and fatigue.

Whiz: a urinary tract infection is possible if urinary catheterization was required.