Yes - I think it is reasonable to call both his oncologist, but more importantly his surgeon.
There are number of things that come to mind based on the history you provided.
A urinary tract infection
Pneumonia - more common after abdominal surgery
Wound infection or abdominal abscess(collection of pus)
I would think that a blood count to check his white count (if elevated a possible sign of infection), a urinalysis with urine culture, and possibly a chest x-ray
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