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What Causes Rise In Body Temperature?

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Posted on Tue, 1 Jul 2014
Question: My normal body temperature is around 96.6 to 97.5. For the last 14 days I have been running a low grade fever in the afternoons and evenings (feel fine in the morning). Until yesterday my temp never got above 100.4, generally hovering between 99.8 to 100.3. Last night it got all the way up to 100.9.
I have Multiple Myeloma and am on Revlimid. My WBC is a little low, but not horrendously so, and except for the fever I have no other symptoms of infection. My oncologist told me to stop taking Revlimid six days ago, but it hasn't made a difference in the fever. Chest X-ray (taken on Friday) is clear. Urinalysis is clear. Nobody has come back to me on the results of the blood culture, which tells me that nobody is horribly worried about it. However, I feel miserable; you know, fevery; crawly, achey, shivery, the stuff that comes with a fever. I was told to go to urgent care if my temp went above 100.4; I did....that's why I got all those tests on Friday. I can't see going back, frankly; miserable trip and what the heck would they DO about it?
Here's my question;
It seems to me that if a 'normal' person, with an average BT of 98.6, only has to raise his temp a degree or so to get to 'low grade fever.' A two degree rise gets an adult into 'we need to worry about this a bit." and a three degree rise puts him into "Holy Cow, this guy is sick..." range; 101.6.
But my body would have to, in order to get to the 101.6 area, rise 4.5 degrees or so, and trust me, at 98.6, I'm feeling feverish.
I am finding out that elderly people often present with infections and pneumonia without fevers...but is it because they aren't 'running fevers,' or because they ARE...but since they start lower on the thermometer, nobody pays attention? In other words, what's more important here: the absolute numbers, or the relative rise in temperature?
doctor
Answered by Dr. Raju A.T (5 hours later)
Brief Answer:
Relative rise in temp is important

Detailed Answer:
Hi,

Thanks for your query.

Your's is a very good question, many doctors do miss this logic and over treat or undertreat a person.

Yes, it is the relative rise in temperature what indicates the presence of fever or any infection. Usually most of the infections viral or bacterial do produce fever, a rise in body temperature. There would always be a degree or two more than the basal body temperature which can vary in many.

In you, I do suspect an infection. I believe you may have to repeat a few tests to confirm the same like urine analysis and WBC count. I also doubt the blood culture to turn positive. It is urine tract infections or any other focal infections which present this way. Also, do check whether you have got a differential count of the WBCs done. If so, please forward it to me , which can help to identify what kind of infection it is. Even though the WBC count is not high, the relative difference between the different WBC cells indicate the type and presence of the infection.

Hope, I answered your query.

Wish you good health.

Regards,
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Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Raju A.T

General & Family Physician

Practicing since :2008

Answered : 4927 Questions

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What Causes Rise In Body Temperature?

Brief Answer: Relative rise in temp is important Detailed Answer: Hi, Thanks for your query. Your's is a very good question, many doctors do miss this logic and over treat or undertreat a person. Yes, it is the relative rise in temperature what indicates the presence of fever or any infection. Usually most of the infections viral or bacterial do produce fever, a rise in body temperature. There would always be a degree or two more than the basal body temperature which can vary in many. In you, I do suspect an infection. I believe you may have to repeat a few tests to confirm the same like urine analysis and WBC count. I also doubt the blood culture to turn positive. It is urine tract infections or any other focal infections which present this way. Also, do check whether you have got a differential count of the WBCs done. If so, please forward it to me , which can help to identify what kind of infection it is. Even though the WBC count is not high, the relative difference between the different WBC cells indicate the type and presence of the infection. Hope, I answered your query. Wish you good health. Regards,