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Seek immediate medical attention if you've recently visited an area in which dengue fever is known to occur, you have had a fever and you develop any of the warning signs. Severe dengue fever is a life-threatening medical emergency.

Bleeding under the skin, which might look like bruising.

The warning signs usually begin the first day or two after your fever goes away, and may include: Warning signs of severe dengue fever - which is a life-threatening emergency - can develop quickly. This can lead to shock, internal bleeding, organ failure and even death. And the number of clot-forming cells (platelets) in your bloodstream drops.

Severe dengue happens when your blood vessels become damaged and leaky. This is called severe dengue, dengue hemorrhagic fever or dengue shock syndrome. In some cases, symptoms worsen and can become life-threatening. When symptoms do occur, they may be mistaken for other illnesses - such as the flu - and usually begin four to 10 days after you are bitten by an infected mosquito.ĭengue fever causes a high fever - 104 F (40 C) - and any of the following signs and symptoms:

Many people experience no signs or symptoms of a dengue infection.