A fever is one way your body fights illness—your body temperature goes up to kill bacteria that cannot live at the higher temperatures. Although it may not be comfortable, a temperature of up to 102°F is generally good for you. Most healthy adults can tolerate a fever as high as 103°F to 104°F for short periods of time without having problems. Jun 19, 2019 · A fever is an increase in your body temperature. Normal body temperature is 98.6°F (37°C). Fever is generally defined as greater than 100.4°F (38°C). What are common causes of a fever? The cause of your fever may not be known. This is called fever of unknown origin. It occurs when you have a fever above 100.9˚F (38.3°C) for 3 weeks or more.
Apr 01, 2015 · Fever means a body temperature of 100.4° F (38°C) or higher. An infection, such as the flu, is the most common cause of fever. Other conditions can also cause a fever. These include diseases that produce inflammation, such as rheumatoid arthritis, reactions to drugs or vaccines, and even certain types of cancers. Fever symptoms. Find out more about fever symptoms in adults, when you can use self-care, and what to do if your condition worsens and you need medical help. Find out more about fever symptoms in adults, when you can use self-care, and what to do if your condition worsens and you need medical help.
Feb 08, 2011 · A fever-- also known as a high fever or a high temperature -- is not by itself an illness. It's usually a symptom of an underlying condition, most often an infection. Fever is usually associated. Fever in Adults Causes. Viral Fever. Illnesses caused by viruses are among the most frequent causes of fever in adults. Common symptoms can include a runny nose, sore throat, cough, hoarseness, and muscle aches.Viruses also may cause diarrhea, vomiting, or an upset stomach.. For the most part, these viral illnesses will improve simply with time.
However, older people with a fever are more likely to have a serious bacterial infection than are younger adults with a fever. As in younger adults, the cause is commonly a respiratory or urinary tract infection. Skin and soft-tissue infections are also common causes in older people.