Dengue Fever: Symptoms, Prevention, Warning Signs and When to Seek Medical Care
Dengue is a mosquito-borne viral infection that is common in many tropical and subtropical regions, including India. It can affect people of all ages and may range from a mild febrile illness to a serious condition requiring hospital care. Dengue is transmitted mainly through the bite of infected Aedes mosquitoes, particularly Aedes aegypti. These mosquitoes can breed in small collections of stagnant water around homes, workplaces, schools, and other public spaces. Because dengue can sometimes become serious, understanding its symptoms, recognising warning signs, preventing mosquito bites, and seeking timely medical attention are important steps in protecting individuals and families.
What Is Dengue?
Dengue is caused by the dengue virus, which is transmitted to people through the bite of infected mosquitoes. After a mosquito carrying the virus bites a person, the virus multiplies in the body and symptoms may develop after an incubation period. Dengue infection can occur more than once because there are four main dengue virus serotypes. Infection with one serotype generally provides long-lasting immunity to that serotype, but not necessarily to the others. A second dengue infection with a different serotype may sometimes be associated with a greater risk of severe disease.
How Does Dengue Spread?
Dengue does not usually spread directly from one person to another through ordinary casual contact. The usual transmission cycle involves an infected person and an Aedes mosquito. When a mosquito bites a person who has dengue virus in their blood, the mosquito can become infected. It can subsequently transmit the virus when it bites another person.
Aedes aegypti mosquitoes commonly breed in containers that hold water, including:
- Buckets
- Flowerpots and trays
- Discarded tyres
- Water storage containers
- Cans and bottles
- Construction-site containers
- Other objects capable of collecting stagnant water
Importantly, mosquito breeding does not require a large pond or open water body. Even small amounts of stagnant water can provide suitable breeding conditions.
What Are the Symptoms of Dengue?
Dengue commonly presents with an acute fever and other symptoms.
Common symptoms may include:
- High fever
- Severe headache
- Pain behind the eyes
- Muscle and joint pain
- Body aches
- Nausea
- Vomiting
- Skin rash
- General weakness or tiredness
Symptoms can vary from person to person. Some individuals may have relatively mild illness, while others can develop more serious complications. Because many other infections can also cause fever, symptoms alone cannot always confirm dengue. A doctor may recommend appropriate laboratory testing based on the patient’s symptoms, illness duration, age, risk factors, and local disease patterns.
Understanding the Different Phases of Dengue
Dengue illness is commonly described in three phases:
1. Febrile Phase
The illness often begins with fever, which may last for several days.
During this period, a person may experience headache, body aches, nausea, vomiting, rash, and other symptoms.
Adequate fluid intake, monitoring, medical advice, and appropriate symptomatic treatment are important during this stage.
2. Critical Phase
An important point about dengue is that a patient’s condition may change around the time the fever starts to settle.
The critical phase often occurs around the time of defervescence—the period when fever decreases—and may last approximately 24–48 hours in patients who develop plasma leakage.
This is why improvement in fever does not always mean that the danger has completely passed.
Warning signs need to be watched carefully during this period.
3. Recovery Phase
Patients who pass through the critical phase without major complications generally enter a recovery phase.
Appetite and overall well-being may improve, and the body gradually returns towards normal.
Medical monitoring should continue according to the treating doctor’s advice.
What Are the Warning Signs of Severe Dengue?
Most people with dengue recover without developing severe disease. However, some patients can develop complications and require urgent medical care.
Warning signs can include:
- Severe abdominal pain or tenderness
- Persistent vomiting
- Bleeding from the gums or nose
- Vomiting blood
- Blood in the stool or black stools
- Unusual vaginal bleeding
- Marked weakness, restlessness, or drowsiness
- Difficulty breathing
- Cold or pale skin
- Reduced urine output
- Other signs of shock or organ involvement
These symptoms require urgent medical assessment.
Do not wait for all warning signs to appear before seeking help.
When Should You Go to the Hospital?
A person with suspected or confirmed dengue should be medically evaluated if symptoms are significant, persistent, worsening, or associated with risk factors for complications.
Immediate medical attention is particularly important if warning signs appear.
Hospital evaluation may also be especially important for people who are:
- Very young children
- Older adults
- Pregnant
- Living with significant chronic medical conditions
- Unable to maintain adequate fluid intake
- Showing signs of dehydration
- Developing bleeding or other warning symptoms
The treating doctor will determine whether outpatient monitoring is appropriate or whether hospital observation or admission is required.
How Is Dengue Diagnosed?
Dengue diagnosis is based on the clinical picture and, when appropriate, laboratory testing. The choice of test depends partly on how many days the patient has been ill. Tests may include methods that detect components of the virus, such as NS1 antigen or viral genetic material, particularly during the earlier stage of illness. Antibody tests may also be useful at different stages of infection. Blood counts, including platelet measurements and hematocrits, may be monitored in patients when clinically indicated. It is important to understand that a platelet count alone does not determine whether a patient has dengue or whether hospitalization is required. Doctors assess the complete clinical picture, including symptoms, hydration, bleeding, blood pressure, hematocrits, platelet trends, organ function, and warning signs.
Platelets and Dengue: What Patients Should Know
Platelet counts often receive significant attention when someone has dengue. However, a falling platelet count does not automatically mean that severe dengue will develop, and a low platelet count by itself is not the only factor used to determine treatment. Doctors consider several parameters together. Patients should therefore avoid making treatment decisions based solely on a single platelet report. Repeated testing may be advised depending on the stage of illness and the patient’s clinical condition.
Treatment for Dengue
There is currently no specific antiviral treatment routinely used to eliminate dengue virus. Treatment is mainly supportive and focuses on maintaining adequate hydration, controlling symptoms, monitoring the patient’s condition, and identifying complications early.
Depending on the patient’s condition, treatment may include:
- Adequate oral fluids
- Rest
- Medical monitoring
- Appropriate fever and pain management
- Laboratory monitoring when required
- Intravenous fluids in selected patients
- Management of complications in hospital when necessary
Medication should be taken only according to medical advice.
Which Painkillers Should Be Avoided?
This is particularly important when dengue is suspected. Medicines such as aspirin and non-steroidal anti-inflammatory drugs (NSAIDs) are generally avoided because they can increase the risk of bleeding. Patients should not self-medicate with painkillers without medical guidance. For fever and pain, a healthcare professional can advise on an appropriate medicine and dose based on the patient’s age, weight, medical history, and condition.
Should Every Dengue Patient Be Hospitalised?
No. Not every person diagnosed with dengue requires hospital admission. Many patients can be managed as outpatients when they are clinically stable, able to drink adequate fluids, have no warning signs, and can return for appropriate follow-up. Hospitalisation may be required when warning signs, significant dehydration, bleeding, shock, organ involvement, inability to maintain oral intake, or other clinical concerns develop. The decision should be made by the treating healthcare team based on the patient’s overall condition.
How Can Dengue Be Prevented?
There is no better strategy for dengue prevention than reducing mosquito exposure and eliminating mosquito breeding sites.
Remove Stagnant Water
Check your surroundings regularly for containers that collect water. Empty, clean, cover, or dispose of them appropriately.
Particular attention should be given to:
- Plant trays
- Buckets
- Water storage containers
- Old tyres
- Bottles and cans
- Roof gutters and other areas where water may collect
- Construction materials and containers
Protect Yourself From Mosquito Bites
Because Aedes mosquitoes can bite during the daytime as well as at other times, protection should not be limited only to nighttime.
Helpful measures include:
- Using mosquito repellents appropriately
- Wearing clothing that covers the arms and legs when practical
- Using screens or other barriers
- Using mosquito nets when appropriate
- Keeping doors and windows protected where possible
Children should also be protected from mosquito bites, especially during outdoor activities.
Dengue Prevention Begins at Home
Preventing dengue is not only an individual responsibility.
A single breeding site in a residential area can contribute to mosquito multiplication and increase risk within the surrounding community.
Families should regularly inspect:
- Balconies
- Terraces
- Gardens
- Plant pots
- Water tanks
- Drains
- Storage areas
- Outdoor containers
Community participation is particularly important during periods when dengue transmission is high.
Dengue in Children
Children with dengue may develop symptoms similar to adults, including fever, headache, body aches, vomiting, and rash. However, young children may not always be able to clearly describe their symptoms.
Parents should watch for:
- Persistent fever
- Poor feeding or reduced fluid intake
- Repeated vomiting
- Excessive sleepiness or unusual irritability
- Abdominal pain
- Bleeding
- Reduced urine output
- Any sudden deterioration
If a child with suspected dengue appears unusually unwell or develops warning signs, medical assessment should not be delayed.
Dengue During Pregnancy
Pregnant women with suspected dengue should seek medical advice promptly.
Pregnancy requires special consideration because dengue can have implications for both the mother and pregnancy, particularly when the illness becomes severe.
Treatment and monitoring should be guided by healthcare professionals familiar with the patient’s pregnancy and overall medical condition.
Common Myths About Dengue
Myth 1: “Every dengue patient needs a platelet transfusion.”
Fact: Platelet transfusion is not automatically required simply because the platelet count is low. Doctors consider bleeding, clinical condition, platelet trends, and other relevant factors before deciding on transfusion.
Myth 2: “Once the fever comes down, the patient is safe.”
Fact: The period when fever settles can coincide with the critical phase in some patients. Warning signs should continue to be monitored.
Myth 3: “Dengue mosquitoes only bite at night.”
Fact: Aedes mosquitoes can bite during the daytime. Protection should therefore be maintained throughout the day.
Myth 4: “A low platelet count alone tells us how severe dengue is.”
Fact: Severity assessment involves much more than the platelet count. Doctors consider the complete clinical picture and other laboratory findings.
Myth 5: “Dengue can be treated by antibiotics.”
Fact: Dengue is caused by a virus, so antibiotics do not treat the dengue virus. Antibiotics may be prescribed only when there is a separate bacterial infection or another specific medical indication.
What Should You Do If You Suspect Dengue?
If you develop a sudden high fever accompanied by severe headache, body aches, nausea, vomiting, rash, or other symptoms suggestive of dengue, consult a healthcare professional. Do not rely only on home remedies or self-medication.
Follow your doctor’s advice regarding:
- Diagnostic testing
- Fluid intake
- Fever management
- Blood tests
- Follow-up visits
- Warning signs that require urgent care
If the patient’s condition suddenly worsens, seek emergency medical attention immediately.
Protect Your Family From Dengue
Dengue prevention starts with simple actions. Every week, take a few minutes to inspect your home and surroundings for stagnant water. Keep water containers covered, clean plant trays regularly, dispose of unwanted containers, and use appropriate mosquito protection. At the same time, learn to recognize the symptoms and warning signs of dengue. Early medical evaluation and careful monitoring can be important, particularly when symptoms worsen or warning signs appear.
Conclusion
Dengue is a preventable mosquito-borne infection, but it should never be taken lightly. Understanding how dengue spreads, recognizing its symptoms, monitoring for warning signs, avoiding inappropriate self-medication, and seeking timely medical care can help reduce the risk of serious complications. Most importantly, dengue prevention begins before anyone develops a fever. Eliminating stagnant water and protecting ourselves from mosquito bites are simple actions that can make a meaningful difference.
If you or a family member develops symptoms suggestive of dengue, consult a qualified healthcare professional for appropriate evaluation and guidance. At East Point Hospital, our healthcare teams provide medical consultation, diagnostic evaluation, emergency care, and appropriate treatment for patients with acute illnesses and other health concerns. Stay alert, prevent mosquito breeding, protect your family, and seek medical care promptly when warning signs appear.
This article is intended for general health education and does not replace consultation with a qualified medical professional.
