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Dengue (break-bone fever) is a viral infection that spreads from mosquitoes to people. It is more common in tropical and subtropical climates.

Most people with dengue have mild or no symptoms and will get better in 1–2 weeks. Rarely, dengue can be severe and lead to death.

If symptoms occur, they usually begin 4–10 days after infection and last for 2–7 days. Symptoms may include:

high fever (40°C/104°F)
severe headache
pain behind the eyes
muscle and joint pains
nausea
vomiting
swollen glands
rash.
Individuals who are infected for the second time are at greater risk of severe dengue.

Severe dengue symptoms often come after the fever has gone away:

severe abdominal pain
persistent vomiting
rapid breathing
bleeding gums or nose
fatigue
restlessness
blood in vomit or stool
being very thirsty
pale and cold skin
feeling weak.
People with these severe symptoms should get care right away.

After recovery, people who have had dengue may feel tired for several weeks.