Dengue Symptoms: Early Signs & Warning Signs to Watch

Quick Glance: Common Dengue Symptoms

Common dengue symptoms mostly appear 4 to 10 days after infection and may last for 2 to 7 days. The most commonly observed symptoms of dengue may include:

High fever, which may reach around 104°F (40°C)
Severe headache
Pain behind the eyes
Muscle, bone or joint pain
Nausea or vomiting
Skin rash
Swollen glands
Extreme tiredness or weakness

Symptoms can vary from person to person. Some people may have only mild symptoms or no noticeable symptoms, while others develop more significant illness.

Symptoms of Dengue That Should Not Be Ignored

The following warning signs may indicate that dengue is progressing towards severe disease. They often appear during the critical phase, particularly around the time the fever settles. Check out the symptoms of dengue that should not be ignored:

Symptom	What It May Indicate
Severe abdominal pain or tenderness	Possible progression towards severe dengue and an increased risk of complications.
Persistent or repeated vomiting	Increased risk of dehydration and severe dengue.
Bleeding from the nose or gums	Possible bleeding tendency associated with severe dengue.
Blood in vomit or stools	Possible gastrointestinal bleeding.
Extreme tiredness, restlessness or irritability	May occur with worsening illness or reduced circulation.
Rapid or difficult breathing	May indicate fluid accumulation or respiratory involvement.
Pale, cold or clammy skin	May indicate poor circulation or shock.
Reduced urination or marked thirst	May indicate significant fluid loss or dehydration.

These symptoms warrant prompt medical assessment rather than waiting for the illness to improve on its own.

Why Do Dengue Symptoms Occur?

Dengue symptoms occur when the dengue virus triggers an immune response in the body. This can cause inflammation, leading to fever, headache, muscle and joint pain, nausea and tiredness.

The infection can also affect blood cells and blood vessels. A temporary drop in white blood cells and platelets may occur, while increased leakage from blood vessels can cause fluid to move into surrounding tissues. In severe dengue, significant plasma leakage can reduce blood circulation and lead to shock.

A skin rash may appear as the illness progresses or during recovery. Importantly, the fever settling does not always mean the illness is improving, as warning signs can develop around this time.

Symptoms of Dengue That Require Immediate Medical Attention

Seek urgent medical care if a person with suspected or confirmed dengue develops any of the following:

Severe or persistent abdominal pain
Repeated vomiting
Vomiting blood
Blood in the stools
Bleeding from the nose or gums
Rapid or difficult breathing
Extreme weakness, unusual sleepiness or restlessness
Pale, cold or clammy skin
Very little or no urine
Severe thirst or signs of significant dehydration
Confusion, reduced alertness or loss of consciousness
Sudden worsening after the fever begins to settle

Severe dengue is a medical emergency. It can involve severe plasma leakage, shock, significant bleeding or organ impairment and can become serious within a few hours.

Symptoms of Dengue Based on Type

The table below mentions the symptoms of different types of dengue:

Type	Symptoms
Dengue without warning signs	High fever, headache, pain behind the eyes, muscle and joint pain, nausea, vomiting and rash.
Dengue with warning signs	Abdominal pain or tenderness, persistent vomiting, fluid accumulation, lethargy, mucosal bleeding, restlessness or liver enlargement.
Severe dengue	Severe plasma leakage can lead to shock or respiratory distress, severe bleeding, or severe organ impairment.

Symptoms of Dengue in Children

Children can develop the same core dengue symptoms as adults, including fever, headache, body aches, nausea, vomiting and rash. However, younger children may not always be able to clearly describe symptoms such as pain behind the eyes or muscle and joint pain.

Parents and caregivers should pay attention to changes in behaviour, feeding and hydration. Excessive sleepiness, unusual irritability, repeated vomiting, reduced urine output, abdominal pain, bleeding, or difficulty breathing require prompt medical evaluation.

Infants and young children may also become dehydrated more quickly when fever or vomiting is present. Any child with suspected dengue should be monitored closely, particularly as the fever starts to settle.

Can You Have Dengue Without Symptoms?

Yes. Dengue infection can occur without noticeable symptoms. The WHO reports that many dengue infections are asymptomatic or cause only mild illness. When symptoms do occur, they commonly begin several days after infection and may initially resemble other viral illnesses. This can make dengue difficult to identify based on symptoms alone.

A person with fever who lives in or has recently travelled to an area where dengue is prevalent should discuss their symptoms and exposure history with a healthcare professional. A blood test may be needed to confirm dengue.

When Can Dengue Symptoms Become Life-Threatening?

Certain life-threatening symptoms of dengue are as follows:

Symptoms	What can happen
Severe plasma leakage and shock	In severe dengue, plasma can leak from blood vessels, reducing the amount of circulating fluid. Significant leakage can lead to shock, which requires immediate medical treatment.
Excessive bleeding	A major decline in platelet count and alterations in blood vessels might lead to bleeding. Blood in vomit or stools, or bleeding from the nose or gums, should be assessed urgently.
Respiratory distress	Fluid can accumulate around the lungs or elsewhere in the body because of plasma leakage. This may cause rapid or difficult breathing and requires immediate medical attention.
Severe organ impairment	Severe dengue can affect organs such as the liver, brain and heart. Reduced consciousness, severe weakness or other signs of organ dysfunction require emergency care.

How are Dengue Symptoms Diagnosed?

Dengue cannot be reliably diagnosed from symptoms alone because several other infections can cause similar fever and other symptoms. Healthcare professionals consider symptoms, examination findings, location, travel history and laboratory results to confirm dengue. The following table lists the diagnostic tests used for dengue:

Diagnostic Test	Purpose
NS1 antigen test	Detects dengue NS1 protein, particularly during the first 7 days of illness.
RT-PCR/NAAT	Detects dengue virus RNA and can confirm an acute infection, especially during the first 7 days.
Dengue IgM antibody test	Detects an immune response to a recent dengue infection and becomes more useful as the illness progresses.
Complete blood count (CBC)	Helps monitor white blood cells, platelets and haematocrit during the illness.
Liver function tests	May be used when liver involvement is suspected or to assess the severity of illness.

FAQs

Q1. What is the first symptom of dengue?

Ans: Fever is usually the most common initial symptom of dengue. It is often accompanied by headache, pain behind the eyes, muscle or joint pain, nausea, vomiting or rash.
Q2. What are the early warning signs of dengue?

Ans: The early warning signs of severe dengue may include abdominal pain or tenderness, persistent vomiting, bleeding from the nose or gums, blood in vomit or stools, extreme tiredness or restlessness and breathing difficulties. These symptoms require immediate medical treatment.
Q3. Can dengue develop without symptoms?

Ans: Yes. Many dengue infections cause no noticeable symptoms or only mild illness. A person can therefore have dengue without experiencing the typical combination of fever, pain and rash.
Q4. Can dengue symptoms get worse after the fever goes away?

Ans: Yes. This is an important feature of dengue. Warning signs of severe dengue can appear around the time the fever settles, particularly during the following 24 to 48 hours. A reduction in temperature should therefore not automatically be taken as a sign of complete recovery.
Q5. Are dengue symptoms different in men and women?

Ans: No. The core symptoms of dengue are often the same in men and women.
Q6. How long do dengue symptoms last?

Ans: Typical dengue symptoms mostly last around 2 to 7 days, although recovery can take longer. Most patients recover within one to two weeks, and tiredness can continue for several weeks after the acute illness.
Q7. When should I see a doctor for dengue symptoms?

Ans: It is important to consult a healthcare professional if you experience fever and symptoms that could be dengue, particularly if you live in or have recently travelled to an area where dengue is present. Medical assessment is important if symptoms are worsening or warning signs are observed.
Q8. Which dengue symptoms indicate an emergency?

Ans: Symptoms of dengue that require immediate medical help are severe abdominal pain, repeated vomiting, bleeding, blood in vomit or stools, difficulty breathing, extreme weakness, confusion, reduced urination, pale or cold skin and loss of consciousness. Severe dengue can progress quickly and may require hospital care.