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We often warn our cancer patients here at UT MD Anderson to alert their care teams if they develop a fever.

But how high does your body temperature have to go in order to qualify as one? What¡¯s the difference between a low-grade fever and a high-grade fever? And, when should you start to worry?

Here¡¯s what to know about fevers, including when to seek help and why the rules are different for cancer patients.