7 Dengue Warning Signs You Must Not Ignore

Quick answer

Most dengue is mild and settles at home with rest, fluids and paracetamol. A small number of cases progress to severe dengue, and that usually happens between day 3 and day 7, at the point when the fever comes down. The seven warning signs below mean going to hospital immediately. Never take ibuprofen, aspirin, diclofenac or Combiflam for a suspected dengue fever.

Key takeaways

• Only paracetamol. Ibuprofen, aspirin, diclofenac, nimesulide and combination tablets such as Combiflam increase bleeding risk in dengue and must be avoided entirely.

• The danger window is when the fever falls, usually day 3 to 7. Feeling better is exactly when to watch most carefully, not when to relax.

• Warning signs are different from ordinary dengue symptoms. Fever, headache and body ache are the illness. The seven signs below mean it is becoming severe.

• A low platelet count alone does not decide severity. Warning signs, hydration and how the person looks matter far more than the number.

• Dengue in pregnancy needs obstetric care, not just a physician, because the risks to mother and baby are different.

Ordinary dengue symptoms versus warning signs

This distinction is the most important thing on the page, and most articles blur it.

Severe joint and muscle pain is why dengue is called breakbone fever. It is unpleasant, and on its own it is not a warning sign.

The dengue timeline, and why day 3 to 7 matters most

The point almost everyone misses: severe dengue does not usually develop while the fever is at its peak. It develops as the temperature comes down and the person appears to be improving.

That is why families stop monitoring at exactly the wrong moment. When the fever settles between day 3 and day 7, monitoring should increase, not stop.

The 7 warning signs

Any one of these means go to hospital immediately, whatever the platelet count says and however well the person seemed an hour ago.

1. Severe stomach pain or tenderness

Persistent abdominal pain, or a tummy that hurts when pressed. This is one of the earliest and most reliable warning signs, and it is commonly dismissed as gastritis or acidity.

2. Persistent vomiting

Vomiting three or more times in a few hours, or being unable to keep fluids down. Dehydration accelerates deterioration in dengue.

3. Bleeding from anywhere

• Bleeding gums or nosebleeds

• Blood in vomit, or vomit that looks like coffee grounds

• Black, tarry stools, or blood in stool

• Unusually heavy menstrual bleeding

• Bruising easily, or small red spots under the skin that do not fade when pressed

4. Extreme tiredness or restlessness

Unusual drowsiness, difficulty waking, confusion, or the opposite, agitation and being unable to settle. A sudden change in behaviour or alertness is significant, especially in children and older adults.

5. Cold, clammy, pale skin with a fast, weak pulse

This suggests circulation is failing and is a sign of dengue shock. Call an ambulance rather than arranging transport yourself.

6. The fever drops but the person gets worse

Temperature falling is normal around day 3 to 5. Temperature falling while the person becomes weaker, more uncomfortable, or unwell in a new way is not. This is the pattern that catches families out most often.

7. Reduced urination, or difficulty breathing

Passing much less urine than usual, or none for many hours. Breathlessness, or a swollen abdomen with rapid shallow breathing, which can indicate fluid accumulation.

Warning signs in children and babies

Children can deteriorate faster than adults, and their signs are less obvious. Our guide on what to do if your child has dengue covers home care in more detail.

🚩 Take a child to hospital immediately for:

• Any of the seven signs above

• Refusing feeds or fluids, or far fewer wet nappies than usual

• No tears when crying, a dry mouth, or a sunken soft spot in a baby

• Unusual drowsiness, floppiness, or difficulty waking

• Persistent crying that is different from usual, or being inconsolable

• Cold hands and feet with a warm body

• Fast or laboured breathing

• Any fever in a baby under 3 months, whatever the suspected cause

• A rash that does not fade when pressed with a glass

• A seizure

Babies under one are at higher risk and should be assessed early rather than watched at home. The same breathing and dehydration signs apply to any childhood fever, which our guide to cough and cold in infants and home remedies for toddlers both cover.

Dengue in pregnancy

This needs obstetric care, not just a physician, and it should not be managed at home. Our full guide to dengue during pregnancy goes into the risks and treatment in detail.

• Pregnant women appear to be at higher risk of severe dengue, and the illness can be harder to recognise because some symptoms overlap with pregnancy

• Dengue near delivery raises the risk of bleeding for both mother and baby, because platelets may be low at exactly the wrong moment. This matters most in the third trimester

• The virus can pass to the baby around the time of birth

• Dengue can be confused with other conditions in pregnancy, including pre-eclampsia and HELLP syndrome, which is another reason for proper assessment

• Paracetamol only. NSAIDs are avoided in dengue and are also restricted in pregnancy from 20 weeks

If you are pregnant and have a fever with body ache during dengue season, contact your obstetrician the same day. Fever is on the list of pregnancy symptoms that need urgent medical attention. Do not wait to see how it develops, and do not self-medicate.

The painkiller warning

🚩 This is the most important practical point in the whole article.

Take only paracetamol for fever and pain in a suspected dengue infection, at the dose your doctor advises.

Never take:

• Ibuprofen (Brufen, Advil)

• Aspirin (Disprin)

• Diclofenac (Voveran)

• Nimesulide

• Combination tablets such as Combiflam, which contain ibuprofen alongside paracetamol

• Pain balms, gels and sprays containing NSAIDs, which many do

Why: these medicines interfere with platelet function and irritate the stomach lining, both of which substantially increase bleeding risk when platelets are already falling.

This matters in India specifically because Combiflam and similar tablets are bought over the counter for fever routinely, often before anyone suspects dengue. During dengue season, use paracetamol for any fever until a diagnosis is clear.

Also avoid steroids and antibiotics unless a doctor has specifically prescribed them. Antibiotics do not work on dengue, which is viral.

Testing: what to ask for

Follow up as your doctor advises. In the critical phase this often means a daily blood count, because the trend over days tells far more than one reading.

About platelet counts

Platelet count causes more panic in Indian families than almost any other number, and it is widely misunderstood.

• A low platelet count alone does not mean severe dengue. Platelets fall in most dengue infections and recover on their own

• Warning signs, hydration and how the person looks matter far more than the number

• Platelet transfusion is not usually needed simply because the count is low. It is generally reserved for active significant bleeding, or for very low counts in specific circumstances, decided by the treating doctor

• Counts typically fall around day 3 to 7 and recover from around day 7 to 9

• Do not chase daily counts at private labs without medical guidance, and do not seek transfusion on your own

On papaya leaf juice, which almost every Indian family will be offered: some small studies have suggested it may raise platelet counts, but the evidence is limited and it has not been shown to change how the illness turns out. It is not a treatment for dengue, and it must never replace medical monitoring, fluids or hospital care. If you want to use it, tell your doctor, and do not use it in place of anything.

Home care for mild dengue

Only if your doctor has confirmed it is safe to manage at home.

• Fluids are the mainstay. ORS, water, coconut water, buttermilk, dal water, soups, fresh juice. Small amounts frequently

• Watch urine output. Passing urine regularly, pale in colour, is a good sign

• Rest completely. Do not go back to work or school while feverish

• Paracetamol only, at the dose your doctor advises. Do not exceed it

• Check the temperature and look for warning signs twice a day, and more often between day 3 and day 7

• Use a mosquito net or repellent even while unwell, so mosquitoes do not bite the patient and spread it to others in the house

• Keep the hospital route and a phone number ready, and do not manage a patient alone overnight in the critical phase

When to go to hospital

🚩 Go immediately, at any hour, for:

• Any of the seven warning signs above

• Any bleeding

• Persistent vomiting, or inability to keep fluids down

• Severe abdominal pain

• Drowsiness, confusion or restlessness

• Cold, clammy skin, or a fast weak pulse

• Much reduced urine output

• Difficulty breathing

• Fever with any warning sign in a pregnant woman, a baby, a young child, an older adult, or anyone with diabetes, kidney, liver or heart disease

See a doctor promptly, even without warning signs, if:

• Fever lasts more than two days during dengue season

• You live in an area with an active outbreak

• You have had dengue before. A second infection with a different strain carries a higher risk of severe dengue

• You are pregnant

• The patient is under 1 year or over 65

Preventing dengue

The mosquito that spreads dengue, Aedes aegypti, bites mainly during the day, especially early morning and late afternoon. Mosquito nets at night alone do not protect you.

It breeds in clean, standing water, not dirty drains. This surprises most people.

Weekly, check and empty:

• Air cooler trays

• Flower pots and their saucers

• Water storage drums and buckets

• Refrigerator drip trays

• Discarded tyres, tins and coconut shells

• Terrace and balcony containers

• Pet water bowls

• Overhead and underground tanks, which should be tightly covered

• Blocked roof gutters

Pick one day a week as a dry day and empty, scrub and dry every water container in the house.

Personal protection:

• Repellent on exposed skin during the day, reapplied as directed

• Full-sleeved clothing, light coloured

• Mesh screens on windows and doors

• Mosquito nets for daytime naps, particularly for babies and anyone unwell

• Patches or nets for infants, since many repellents are not suitable for young babies. Check the age on the label

In India, dengue peaks during and after the monsoon, broadly from August to November, though this varies by region. This is when to be most vigilant.

Frequently asked questions

What is the first sign of dengue?
Usually a sudden high fever with severe headache, pain behind the eyes and intense body ache, appearing 4 to 7 days after a mosquito bite.

When is dengue most dangerous?
Between day 3 and day 7, as the fever comes down. Severe dengue usually develops at the point when the patient appears to be improving.

Can I take Combiflam or ibuprofen for dengue fever?
No. Ibuprofen, aspirin, diclofenac, nimesulide and combination tablets such as Combiflam increase bleeding risk. Use paracetamol only.

What platelet count is dangerous in dengue?
There is no single number. Warning signs and the patient's condition matter far more than the count, and a low count alone does not mean transfusion is needed. Your doctor decides based on the whole picture.

Does papaya leaf juice cure dengue?
No. Evidence is limited and it has not been shown to change outcomes. It must never replace fluids, monitoring or hospital care.

How long does dengue last?
Fever typically lasts 2 to 7 days, with recovery over the following week. Tiredness can persist for several weeks afterwards.

Can you get dengue twice?
Yes. There are four strains, and a second infection with a different strain carries a higher risk of severe dengue. Prevention matters just as much after you have had it once.

Is dengue dangerous in pregnancy?
It needs obstetric care. Pregnant women appear to be at higher risk of severe disease, and dengue near delivery raises bleeding risk for mother and baby.

Do dengue mosquitoes bite at night?
Mainly during the day, especially early morning and late afternoon. Daytime protection matters as much as a net at night.

Is dengue contagious from person to person?
No. It spreads only through mosquito bites. But a mosquito biting an infected person can go on to infect others in the house, which is why patients should sleep under a net.

The bottom line

Most dengue is mild, and the difference between mild and severe usually shows itself between day 3 and day 7, as the fever comes down. That is the window to watch most closely, not to relax in. Learn the seven warning signs, treat any one of them as a reason to go to hospital immediately, and take paracetamol and nothing else, because a strip of Combiflam bought for an ordinary fever is one of the most avoidable risks in dengue season.

Sources

• World Health Organization, Dengue and severe dengue

• National Center for Vector Borne Diseases Control, Ministry of Health and Family Welfare, Government of India

• Centers for Disease Control and Prevention, Dengue

• World Health Organization, Dengue guidelines for diagnosis, treatment, prevention and control

• National Guidelines for Clinical Management of Dengue Fever, Government of India

• Indian Academy of Pediatrics, dengue management in children

• Indian Council of Medical Research, dengue epidemiology and diagnostics

This article is for general information and is not a substitute for professional medical advice. If you or your child has any warning sign, go to hospital immediately.

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