Can carcinomas or sarcomas of the colon, esophageal, stomach cause a fever?

Cancer fever: A fever is an common symptom related to many conditions, mostly benign. An increase in body temperature is most often a biological response to a viral or bacterial infection. In some cases, however, a persistent fever can be related to cancer. Most common types of cancers associated with fever- lymphoma and leukemia. If you have had a persistent low grade temperature best to be evaluated.

Yes: Persistent fevers can occur with multiple different types of malignancies. Although most common with tumors of the lymphatics and solid organs like pancreas, kidney, etc. It can also occur as what is termed a paraneoplasic syndrome from almost any tumor.