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Worried about fever with an unknown cause? Here’s what you need to know!


  • A fever with an unknown cause is called acute febrile illness.
  • A fever actually helps the body fight infections and doesn't need to be treated unless you feel very uncomfortable.
  • Generally, the cause is unknown or uncommon.
  • If not severe, self-treatable.

A fever is a reaction of the body to an infection due to a virus or bacteria. Occasionally, cancer or other immune diseases can cause fever wherein the fever lasts for a week or 2. The temperature itself is not harmful in most cases. It actually helps the body fight infections. Sometimes a fever can be an early sign of a serious infection.


If the fever lasts for a long time, a medical professional should be consulted.
People may experience:
A severe headache, pain is the ears, throat, neck, face, joints or abdomen, recurrent vomiting or diarrhea, appearance of a new rash, body temperature of 100.4°F (38°C) or higher.


  • Lab tests will be done
  • If severe symptoms appear, medical help should be sought immediately.


  • Self Care
  • Rest for 2-3 days
  • Avoid smoking
  • Light and balanced diet
  • Increased fluid intake to avoid dehydration

Antibiotics can be prescribed for infections.

In case of a very high fever that doesn’t subside, it is recommended that you consult a physician.

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