Fever

A fever is a body temperature that is higher than normal. A normal temperature can vary from person to person, but it is usually around 98.6 °F (37 °C). A fever is not a disease. It is usually a sign that your body is trying to fight an illness or infection.

Infections cause most fevers. You get a fever because your body is trying to kill the virus or bacteria that caused the infection. Most of those bacteria and viruses do well when your body is at your normal temperature. But if you have a fever, it is harder for them to survive. Fever also activates your body's immune system.

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Results 1 - 10 of 4,593 for fever
  1. Fever (National Library of Medicine)  
    A fever is a body temperature that is higher than normal. A normal temperature can vary from person to ... usually around 98.6 °F (37 °C). A fever is not a disease. It is usually a ...
  2. Dengue (National Library of Medicine)  
    ... in the United States. Symptoms include a high fever, headaches, joint and muscle pain, vomiting, and a ... In some cases, dengue turns into dengue hemorrhagic fever, which causes bleeding from your nose, gums, or ...
  3. Hemorrhagic Fevers (National Library of Medicine)  
    Viral hemorrhagic fevers (VHFs) are a group of illnesses caused by four families of viruses. These include the Ebola and Marburg, Lassa fever, and yellow fever viruses. VHFs have common features: ...
  4. Dengue Fever Test What is a dengue fever test? Dengue fever is a viral infection spread by mosquitos . The virus can't be spread from person to person. Mosquitos that carry ...
  5. Infectious Mononucleosis (National Library of Medicine)  
    ... it at any age. Symptoms of mono include Fever Sore throat Swollen lymph glands Sometimes you may ... helping symptoms and includes medicines for pain and fever, warm salt water gargles and plenty of rest ...
  6. Cold Sores (National Library of Medicine)  
    Cold sores are caused by a contagious virus called herpes simplex virus (HSV). There are two types of HSV. Type 1 usually causes oral herpes, or cold sores. ...
  7. Valley Fever (National Library of Medicine)  
    Valley Fever is a disease caused by a fungus (or mold) called Coccidioides. The fungi live in the soil ... from person to person. Anyone can get Valley Fever. But it's most common among older adults, especially ...
  8. Hay Fever (National Library of Medicine)  
    ... can trigger a type of allergy called hay fever. Symptoms can include Sneezing, often with a runny ... eyes Your health care provider may diagnose hay fever based on a physical exam and your symptoms. ...
  9. Ebola (National Library of Medicine)  
    Ebola hemorrhagic fever is caused by a virus. It is a severe and often fatal disease. It can affect humans and ... after exposure to the virus. Symptoms usually include Fever Headache Joint and muscle aches Weakness Diarrhea Vomiting ...
  10. Cat Scratch Disease (National Library of Medicine)  
    ... especially around the head, neck, and upper limbs Fever Headache Fatigue Poor appetite For people with weak ...
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