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Medical / Infectious Diseases
Dengue is a mosquito-borne viral infection. Most infections are mild or have no symptoms, but some people develop severe dengue. Knowing the early symptoms, warning signs and correct supportive care can help people seek medical attention at the right time.
Medically reviewed: General medical information | Updated: September 2026
Dengue commonly causes sudden fever, severe headache, pain behind the eyes, muscle or joint pain, nausea or vomiting and sometimes a rash. Symptoms usually begin about 4–10 days after infection and may last 2–7 days. Warning signs of severe dengue can appear around the time the fever settles, including severe abdominal pain, persistent vomiting, bleeding, rapid breathing, marked weakness or restlessness. These symptoms need urgent medical assessment.
Dengue symptoms can overlap with other infections, so symptoms alone cannot confirm dengue.
Dengue symptoms often begin 4–10 days after infection. Common features include:
Not everyone develops the same symptoms. Some dengue infections cause mild illness or no noticeable symptoms.
The timing varies, but dengue is commonly described in three phases.
Fever and symptoms such as headache, body aches, nausea, vomiting or rash may occur. Fever commonly lasts about 2–7 days.
In some patients, warning signs appear around the time the fever decreases, often around days 3–7 after illness begins. A lower temperature does not always mean recovery.
People who recover gradually improve. Tiredness can continue for several weeks in some patients.
Severe dengue is a medical emergency. Warning signs can appear as the fever is going away.
Severe dengue is diagnosed clinically and through appropriate monitoring; a single platelet number should not be used by itself to decide whether someone is safe.
If warning signs appear, seek urgent medical assessment even if the fever has decreased.
Doctors combine symptoms, examination, illness timing and laboratory testing to evaluate suspected dengue.
The doctor reviews fever, symptoms, warning signs, medical history and recent travel or exposure.
Depending on the illness stage, testing may detect dengue viral components or antibodies. The most useful test can vary by timing.
A complete blood count may be monitored to assess platelets, white cells and other changes during illness.
Low platelet counts, known as thrombocytopenia, are common in dengue. The fall can occur because dengue affects platelet production and survival and because the immune response contributes to platelet changes.
Platelets are important for blood clotting, but platelet count alone does not determine whether dengue is severe. Doctors also consider bleeding, blood pressure, hydration, hematocrit, organ function, warning signs and the overall clinical picture.
Do not self-treat a low platelet count with medicines or supplements. Follow the treating clinician's monitoring and treatment plan.
There is no specific antiviral medicine that cures dengue. Treatment focuses on safe supportive care and early recognition of complications.
Rest and reduce strenuous activity while recovering. Follow the clinician's advice about follow-up.
Drink appropriate fluids and use oral rehydration or electrolyte drinks when advised. People unable to maintain hydration may need medical care.
Paracetamol/acetaminophen may be used as directed by a clinician. Avoid aspirin and NSAIDs such as ibuprofen unless a healthcare professional specifically advises otherwise.
Aedes mosquitoes that transmit dengue are active during the daytime, so bite prevention matters throughout the day.
| Feature | Dengue | Why this matters |
|---|---|---|
| Fever | Often sudden and high | Fever pattern alone cannot confirm dengue. |
| Body pain | Headache, muscle/joint pain and pain behind the eyes may occur | These features overlap with other infections. |
| Platelets | May decrease | A low count needs clinical interpretation and monitoring. |
| Warning signs | May appear as fever settles | Falling fever does not always mean recovery. |
| Diagnosis | Clinical assessment plus appropriate laboratory testing | Test choice depends partly on timing and local availability. |
Common early symptoms include sudden fever, severe headache, pain behind the eyes, muscle or joint pain, nausea or vomiting and sometimes a rash. Symptoms can overlap with other infections, so medical assessment may be needed.
Symptoms commonly begin about 4–10 days after infection, although the exact timing varies.
Adults may develop fever, headache, pain behind the eyes, muscle and joint pain, nausea, vomiting, rash and fatigue. Severe warning signs require urgent medical care.
Children can have fever, headache, body aches, nausea, vomiting, rash and tiredness. Young children may not describe symptoms clearly, so changes in drinking, urine output, alertness or behavior deserve attention.
Yes. A rash is not required for dengue. Fever, headache, body pain, nausea or other symptoms can occur without a rash.
Dengue is often associated with fever, but not every infection produces the same symptoms. A clinician may consider dengue when exposure and other features fit.
Severe abdominal pain, persistent vomiting, bleeding, rapid breathing, marked weakness or restlessness, blood in vomit or stool, and signs of poor circulation require urgent medical assessment.
It can be. Warning signs of severe dengue may appear around the time the fever decreases, so a lower temperature does not automatically mean the person is recovering.
Platelets may fall during dengue, but there is no single platelet number that by itself defines severe dengue or determines the need for treatment. Doctors interpret the count together with symptoms and other laboratory findings.
Diagnosis uses the clinical picture and appropriate blood tests. The most useful test can depend on how long the person has been ill.
There is no specific antiviral treatment for dengue. Supportive care includes rest, appropriate fluids, fever and pain management, monitoring and urgent treatment when warning signs occur.
Ibuprofen and other NSAIDs are generally avoided when dengue is suspected because they can increase bleeding risk. Paracetamol is commonly used for fever and pain when appropriate.
Aspirin should generally be avoided in dengue because it can increase bleeding risk.
Appropriate fluids help prevent dehydration. Water and electrolyte-containing drinks may be used depending on the person's condition and medical advice.
Go urgently if warning signs appear, including severe abdominal pain, persistent vomiting, bleeding, breathing difficulty, marked weakness or restlessness, or other signs of severe illness.
Many uncomplicated cases can be managed at home with medical guidance, rest, fluids and monitoring. People with warning signs or higher clinical risk may need hospital care.
Reduce mosquito bites with repellents, protective clothing, screens and nets, and remove standing water where Aedes mosquitoes can breed.
Yes. Infection with one dengue virus serotype does not provide complete protection against the other serotypes. A later infection with another serotype can carry a higher risk of severe dengue.
Dengue vaccines exist, but recommendations differ by country, age, prior infection status and transmission setting. Vaccine suitability should be discussed with a qualified clinician and local public-health guidance.
Many people recover within about 1–2 weeks, although fatigue can continue for several weeks after the acute illness.
If you or a family member has fever with symptoms suggestive of dengue, seek medical advice. Urgent assessment is important when warning signs appear.
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