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Fever and nausea can have many causes, including gastrointestinal viral diseases, bacterial infections, and contaminated food. The stomach flu, caused by rotaviruses, can also cause stomach pains, cramps, diarrhea, and vomiting. If excessive vomiting or diarrhea occurs, especially with a fever, it can lead to dehydration, particularly in vulnerable individuals. Other conditions, such as abscesses and hormonal imbalances, can also cause fever and nausea.
It would be difficult to list all the causes of fever and nausea because there are thousands. Fever actually helps decide what might be causing nausea or the urge to throw up, because it knocks a few things off the list. In general, the most common causes of nausea and fever are gastrointestinal viral diseases and parasitic, amoebic, or bacterial gastrointestinal infections. Sometimes people feel nauseous when they have a fever even if they don’t have any form of stomach infection.
The classic stomach flu, which is often caused by a class of viruses called rotaviruses, can cause fever and nausea at the same time in some people. These are rarely the only two symptoms of this disease. Many people also develop stomach pains, cramps, diarrhea and/or vomiting.
Although most people survive the stomach flu and recover from the worst of its symptoms within days, if excessive vomiting or diarrhea occurs, especially with a fever, this can lead to dehydration and the risk is greatest for the very young , the very old , or the vulnerable doctor. Continuous vomiting or diarrhea for more than half a day should be reported in medically vulnerable patients, and people who are ill for more than a day with stomach flu symptoms should also contact their doctors, particularly if fever is above 100.4 degrees F (38 degrees C).
Another common cause of fever and nausea are amoebic, parasitic, or bacterial infections, often resulting from the consumption of contaminated foods. Simple cases of food poisoning can feel similar to the stomach flu. More serious illnesses can cause not only fever and nausea for several days, but also pronounced vomiting and/or diarrhea. Some of these infections persist, creating stomach discomfort for long periods of time, and are particularly worrisome when the stomach discomfort is associated with a long-lasting fever. Such symptoms are always a good indication to see a doctor.
As the body warms up, people may feel sweaty, achy, dizzy, and otherwise uncomfortable. So pretty much any fever can make people feel disoriented and nauseous. This could happen during any type of viral or bacterial infection. People can usually tell that the fever, rather than the illness, is directly causing the nausea because other symptoms point in a different direction.
There are many other conditions that can cause fever and nausea. A pregnant woman with a virus could have both of these symptoms. Some forms of abscesses, stomach cancer, hormonal imbalances, and other conditions could cause these two symptoms as well. There are numerous other examples. These are usually rare compared to the more common and predictable reasons people feel sick to their stomach and develop a fever.
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