Causes of Fever

There are many causes of fever, and it would be almost impossible to list them all. The most common causes of fever are simple illnesses, usually due to a contagious viral infection. But there are many possible causes, and many of them can be serious or even life-threatening, or lead to serious complications. See your doctor for a full diagnosis.

Infectious Respiratory Infections: Some of the more common causes of fever are a viral infection of the airways and respiratory tract. In most cases, the fever would be accompanied with other symptoms, such as cough, runny nose, etc. Some of the many possibilities include:

Complications of Respiratory Infections: Some of the common complications of the common cold, or other respiratory viral infection, can also cause fever themselves.

Infectious Digestive Infections: An infection of the stomach or digestive tract can also cause fever, but usually with other digestive symptoms such as nausea/vomiting, diarrhea, and similar symptoms. There are various types of contagious gastroenteritis that can cause fever. Some of the possibilities include:

Non-Infectious Digestive Disorders: Various inflammatory disorders of the digestive system can cause fever:

Urinary and Kidney Infections: The urinary tract can become infected. Some of the possibilities causing fever include:

Liver Infection: The liver can become inflamed or infected, causing a fever, with conditions such as:

Infections of Other Parts of the Body: An infection anywhere in the body can cause a fever. For example, an abscess can occur at many locations. There are many possibilities, but some examples include:

Pregnancy and Nursing: Various fevers can be related to issues of pregnancy or breastfeeding:

Sexually Transmitted Infections: Various infections related to sexual activity can cause fever, such as:

Women’s Health Conditions: Various conditions of the female reproductive organs can cause fever, such as:

Systemic Inflammations: Various diseases where there is a widespread inflammation, or an autoimmune reaction, can cause a fever:

Non-Infectious Disorders: Fevers can be caused by some causes other than infections, such as:

  • Heat Stress. Exposure to high temperatures, or extreme exercise, can raise the body temperature like a fever.
  • Dehydration
  • Leukemia
  • Cancer (various types)

Other Respiratory Infections: There are many more examples of infections of the respiratory tract, that may cause fever, such as:

Brain and CNS Conditions: Any infection of the brain, the spinal cord, or the CNS can cause a fever, such as:

Heart Conditions: Infections of the heart and other heart conditions can also cause fever, such as:

Other Infections: There are a number of other types of infections that can cause fever, such as:

Medical Care Causes: Causes of fever related to medical activity include:

  • Contrast media reaction (diagnostic test)
  • Post-surgical infection
  • Blood transfusion reaction (“serum sickness”)
  • Vaccination reaction
  • Drug reaction
  • Medication side-effect

Many Other Causes: This discussion has only scratched the surface of the many possible causes of fever. Consult your doctor for a full diagnosis.

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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.