Dengue Fever: What It Is, Symptoms, Treatment, and Warning Signs
Dengue is a viral infection spread by mosquitoes, and although it has long been associated with tropical and subtropical regions, it is no longer something that only travelers need to think about. The virus circulates in many parts of the world, and local transmission can occur wherever mosquitoes capable of spreading dengue are established.
For most people, dengue causes several days of fever, headaches, body aches, and fatigue before the illness gradually improves. But dengue can also become serious, and one of the most confusing things about the infection is that the period when the fever goes away can be the time when complications begin.
Knowing what dengue looks like, how it is treated, and which symptoms should not be ignored can make a significant difference.
What is dengue fever?
Dengue is caused by the dengue virus, which is transmitted primarily through the bite of an infected Aedes aegypti or Aedes albopictus mosquito. These mosquitoes can also transmit other viruses, including Zika and chikungunya.
There are four main dengue virus types, known as DENV-1, DENV-2, DENV-3, and DENV-4. Being infected with one type usually provides long-term protection against that particular type, but it does not provide the same protection against the others.
This means that having dengue once does not mean you cannot get it again. In fact, a second dengue infection can sometimes carry a higher risk of severe disease.
Dengue is not spread through casual contact between people. Instead, the mosquito picks up the virus when it bites an infected person and can then transmit it when it bites someone else.
What are the symptoms of dengue?
Not everyone infected with dengue develops symptoms, but when symptoms do occur, they typically begin about 4 to 10 days after infection and can last for several days.
The illness often starts rather suddenly. So, a person who felt fine the day before may develop a high fever along with a combination of symptoms such as:
- Severe headache
- Pain behind the eyes
- Muscle, bone, or joint pain
- Nausea or vomiting
- Skin rash
- Fatigue and weakness
The body aches can be particularly intense, and this is where the old nickname “breakbone fever” comes from, although dengue does not actually break any bone.
A rash may also appear, sometimes a few days after the fever begins. Because these symptoms can overlap with influenza, COVID-19, other viral infections, and illnesses associated with travel, symptoms alone cannot always tell you whether you have dengue.
When does dengue become dangerous?
Most people with dengue recover without serious complications. The problem is that a small percentage of infections can progress to severe dengue, which can cause shock, severe bleeding, or damage to organs such as the liver.
There is also an important detail that can be easy to miss. Dengue does not necessarily become more dangerous while the fever is at its highest.
In some cases, the critical period begins when the fever starts to come down. This usually happens around the third to seventh day of illness and can last roughly 24 to 48 hours. Someone who thinks they are finally getting better may instead be entering the stage when complications are most likely to appear.
That is why the way a person feels after the fever breaks matters just as much as how they felt during the fever.
What are the warning signs of severe dengue?
Warning signs often appear as the fever is going away. They can include:
- Severe abdominal pain or tenderness
- Persistent vomiting
- Bleeding from the nose or gums
- Vomiting blood or blood in the stool
- Rapid breathing
- Extreme weakness, restlessness, or unusual sleepiness
- Pale, cold skin
- Feeling very thirsty or developing other signs of dehydration
These symptoms warrant prompt medical attention, since severe dengue can worsen quickly. It is not a situation where it is advisable to simply wait another day to see what happens.
This is particularly important for people who have recently traveled to an area where dengue is common. If you develop a fever during or after travel, tell your healthcare provider where you have been. Travel history can be an important part of figuring out which infections are possible.
How is dengue diagnosed?
Dengue cannot reliably be diagnosed based on symptoms alone. A healthcare provider may suspect it based on the symptoms, recent travel or exposure, and whether dengue is currently circulating in the area.
Blood tests can help confirm the infection, but the most appropriate test depends on how long the person has been sick. Some tests look for components of the virus itself, while others detect antibodies produced by the immune system.
Because dengue can look like several other infections, testing can be particularly important when the diagnosis is uncertain.
How is dengue treated?
Since there is currently no specific antiviral medication that cures dengue, the treatment focuses instead on keeping the person hydrated, controlling fever and pain, and watching for signs that the disease is becoming severe.
For fever and pain, acetaminophen is generally preferred. Aspirin and nonsteroidal anti-inflammatory drugs such as ibuprofen and naproxen are usually avoided when dengue is suspected because they can increase the risk of bleeding.
Fever, vomiting, and reduced appetite can make it difficult to stay hydrated, and dehydration can become a problem during an illness that is already affecting the body's circulation, so fluids are equally important.
Most people can recover at home with rest, fluids, and appropriate monitoring. People with warning signs or severe disease may need hospital care and intravenous fluids or other supportive treatment.
Can you prevent dengue?
Because dengue is transmitted by mosquitoes, preventing mosquito bites is one of the most practical ways to reduce your risk.
This is particularly relevant if you are traveling to a region where dengue is common. But mosquito protection can also matter at home in areas where Aedes mosquitoes are present.
Some useful measures include:
- Using an EPA-registered insect repellent
- Wearing long sleeves and long pants when practical
- Using screens on windows and doors
- Removing standing water around your home
- Emptying and cleaning containers that can collect rainwater
Aedes mosquitoes do not need a large body of water to reproduce. Even relatively small containers can provide a breeding site, which is why regularly checking things such as buckets, flowerpots, and outdoor containers can help.
Vaccines are also available in some countries, but recommendations are not the same everywhere. Whether vaccination is appropriate depends on factors such as age, previous dengue infection, and local recommendations, so it is something to discuss with a healthcare professional rather than a one-size-fits-all recommendation.
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