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Dengue

Also called Dengue fever or Breakbone fever

Dengue is an infection caused by a virus spread through the bites of infected mosquitoes, mainly in tropical and subtropical parts of the world. Many people have no symptoms or a flu-like illness that gets better in about a week. A small number develop severe dengue, which can be life-threatening.

Last updated Nov 9, 2026

What it is

A second infection with a different type of dengue raises the risk of severe illness. Avoiding mosquito bites is the main prevention, and vaccines are available for some people.

There is no specific treatment. Rest, fluids and paracetamol help. Anti-inflammatory painkillers such as ibuprofen and aspirin should be avoided because of the risk of bleeding.

Common signs

  • High fever
  • Severe headache and pain behind the eyes
  • Muscle and joint pain
  • Feeling sick or being sick
  • A rash

How it is usually diagnosed

  • Blood tests for the virus or antibodies
  • Blood count to check platelets
  • Questions about travel

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Dengue test results
  • Blood count results during the illness
  • Travel dates and destinations
  • Vaccination records

Questions to ask your doctor

  • Which warning signs should I watch for?
  • Which painkillers are safe?
  • Should I be vaccinated before future travel?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Severe tummy pain, persistent vomiting, bleeding gums or nose, blood in vomit or stool, or drowsiness, especially as the fever settles: call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources

Related conditions

MalariaA serious infection spread by mosquitoes in tropical countries. Symptoms can start weeks after travel and need urgent testing.Zika virusA viral infection spread by mosquitoes in some tropical countries. It is usually mild, but can harm a baby during pregnancy.