Fever and upset stomach are most commonly caused by a bacterial infection in the stomach or intestines. These are relatively common and usually occur due to the consumption of bacteria-carrying food or drink. Viral infections or parasites may also be causes, although these are slightly less common.
As a general rule of thumb, if a fever is present, that usually means that there is an infection somewhere in the body. When fever and upset stomach are present simultaneously, it is usually because the infection resides in the stomach or intestinal tract. Bacteria is the primary cause of most infections, and it can be spread through infected food when it is not cooked thoroughly or properly.
Most times, fever and upset stomach will pass on their own without treatment. The human body is generally capable of killing any infection in between one and three days. Sufferers should get as much rest as possible and avoid eating any foods that may be hard to digest, such as beans or dairy. If temperature is more than a degree or two Fahrenheit higher than average, taking an over the counter fever reducer like acetaminophen is recommended.
Fever and upset stomach are generally not dangerous unless vomiting and diarrhea are present. Although not life-threatening by themselves, these conditions can lead to dehydration, especially if they persist for more than a few hours. Those with either symptom should consume as many fluids as possible, preferably water. Caffeine should be avoided altogether, as it can lead to further fluid loss.
Although unlikely, if fever and upset stomach last more than two or three days, or if they become very severe in nature, a trip to the doctor may be in order. A viral infection, resistant bacterial infection, or parasite may be to blame. The doctor may prescribe antibiotics for a long lasting bacterial infection, or an anti-parasitic for parasites. Viruses must be destroyed by the human body’s immune system, but the doctor may keep an eye out for severe symptoms like dehydration or fever-induced seizures.
In some less common cases, fever and upset stomach may come as the result of an infection which originated somewhere other than the stomach. This generally means that the infection has spread and may be infecting the blood or other bodily systems. If other symptoms are present or a previous infection was not properly treated, a physician's care should be sought immediately to rule out a serious infectious condition.
To prevent a stomach virus or bacterial infection, it is important to thoroughly cook all meats and eggs and to properly refrigerate foods that contain eggs or dairy. The use of a meat thermometer may help to ensure that all items reach the appropriate internal temperature for killing off potentially harmful bugs and parasites. It is also important to ensure that drinking water is safe for consumption. Well water should be tested for cleanliness, and it is usually good to avoid tap water in any non-industrialized country while on vacation.
