Severe Dengue: Warning Signs and When to Go to Hospital
Dengue can turn severe just as the fever goes down. This article explains the warning signs, who is at risk and why early medical care matters.
Scientist and Chief Medical OfficerDr. Ambed Mishra, PharmD, PhDEducational information only, not medical advice. Always ask a qualified doctor about your own health. In an emergency call 112 (India) or 911 (US). Read the full disclaimer.
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Most people with dengue recover at home. But a small number develop severe dengue, and it can worsen fast, often just when the fever seems to be getting better. Knowing the warning signs and acting early is important. This article explains them, using information from the WHO and CDC.
Why the days after the fever matter
The WHO says warning signs of severe dengue often appear after the fever subsides. The CDC says they usually begin 24 to 48 hours after the fever goes away. That is why a person who seems to be recovering still needs close watching. The CDC says severe dengue is a medical emergency, can develop within hours, and can cause shock, internal bleeding or death. It says about 1 in 20 people who get sick with dengue develop severe dengue.
Warning signs to watch for
The WHO and CDC list these signs:
- Severe stomach pain or tenderness
- Persistent vomiting (the CDC says vomiting at least 3 times in 24 hours)
- Rapid breathing
- Bleeding from the nose or gums
- Vomiting blood, or blood in the stool
- Restlessness or irritability
- Extreme thirst, or pale, cold skin
- Extreme tiredness or weakness
The WHO advises seeking care immediately if any of these occur. The CDC advises going to a local clinic or emergency room right away. Do not wait to see if the signs pass.
Who is at higher risk?
The WHO says a second dengue infection raises the risk of severe dengue. Anyone living in or visiting an area with dengue can be affected. Because symptoms of dengue overlap with other fevers, a blood test is the way to confirm it, according to the CDC. The WHO also says dengue is found in more than 100 countries, and that reported cases rose from about 505,000 in 2000 to 14.6 million in 2024, although the true number is probably higher because many cases go unreported.
Care at the hospital
The WHO says there is no specific antiviral treatment for dengue, and that people with severe dengue often need hospital care. The treatment plan is decided by the medical team.
A caution about painkillers
The WHO says ibuprofen and aspirin can increase the risk of bleeding in dengue. If you or a family member has a high fever in a dengue area, ask a doctor which medicine is safe before taking anything. Do not give medicines to children without medical advice.
Reducing the chance of infection
Dengue spreads through mosquito bites, so prevention matters. The WHO suggests covering skin with clothing, fitting window screens, using nets when sleeping during the day, and using repellents with DEET, picaridin or IR3535. It also advises removing or covering containers that hold water, and emptying and cleaning household water storage weekly. Mosquitoes that spread dengue breed in standing water, so these steps are important in homes, buildings and neighbourhoods.
When to see a doctor
See a doctor promptly if you have a fever and live in or have recently travelled to a dengue area. Seek care immediately for any of the warning signs above, even if the fever has already gone.
In an emergency, call your local emergency number (112 in India, 911 in the United States).
Key points
- Severe dengue often shows itself after the fever subsides
- Warning signs include severe stomach pain, repeated vomiting, bleeding and rapid breathing
- It is a medical emergency, so get care at once
- Ask a doctor before taking any painkiller during a suspected dengue illness
- Preventing mosquito bites and removing standing water lowers risk
This article is for education only and does not replace advice from a doctor.
Common questions
When do severe dengue warning signs appear?
The WHO says they often appear after the fever subsides, and the CDC says they usually start 24 to 48 hours after the fever goes away.
What are the warning signs of severe dengue?
The WHO and CDC list severe stomach pain, persistent vomiting, rapid breathing, bleeding from the nose or gums, blood in vomit or stool, restlessness and extreme tiredness.
How common is severe dengue?
The CDC says about 1 in 20 people who get sick with dengue develop severe dengue.
What should I do if I see warning signs?
The WHO advises seeking care immediately, and the CDC says to go to a local clinic or emergency room right away.
Important: please read
- Educational information only. This article is general health education. It is not medical advice, diagnosis or treatment. Reading it does not create a doctor–patient relationship with MyDoctor or with anyone else.
- Ask a qualified doctor. Always talk to a qualified, registered doctor about your own health. In India, that means a doctor registered with the National Medical Commission (NMC) or a State Medical Council. In the United States, a licensed physician. Elsewhere, a doctor licensed where you live.
- Never ignore or delay professional advice because of something you read here. Do not start, stop or change any medicine or treatment without your doctor.
- Emergencies: call 112 in India, 911 in the United States, or your local emergency number. Do not wait for an online answer.
- No product is endorsed. MyDoctor does not recommend any brand, product or supplement in this article.
- About the sources. This article summarises, in our own words, information from the public health bodies named under Sources. Health knowledge changes, and this summary may not reflect the latest research or your personal situation.
- Liability. To the extent permitted by law, MyDoctor (MODERNUS HEALTH TECHNOLOGIES PRIVATE LIMITED) accepts no liability for any decision made on the basis of this content.
Sources
- WHO. Dengue and severe dengue www.who.int
- CDC. Dengue: signs and symptoms www.cdc.gov
Dr. Ambed Mishra, PharmD, PhD
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Dr. Ambed Mishra is a clinical (patient care) scientist, author and former professor. He is Group CEO and Chief Medical Officer of MODERN US HEALTH (MODERN US GROUP), Austin, Texas, the group behind MyDoctor, and a senior consultant who teaches and trains MD/DO physicians, PharmD and PhD professionals, nurses and other healthcare professionals in patient care in the United States and India.
More about Dr. Ambed Mishra
- More than ten years of full-time leadership in United States healthcare, building patient care services that improve medication adherence and bring doctors, pharmacists and nurses together around each patient.
- Leads the MD and engineering teams behind MyDoctor: clinic and hospital management software, electronic health records and telehealth for hospitals and physician groups in the United States and India.
- Former Assistant Professor and Clinical Preceptor at Rajiv Gandhi University of Health Sciences, Bangalore, and senior researcher with hospitals, universities and patient care groups in India and the United States.
- More than 30 published research and review articles and case reports, and more than 15 international conference presentations in India, Australia, Canada, the United States, Spain and other countries.
- Chief Medical Officer and Global Program Head of a nonprofit mission that helps cover hospital and doctor visit bills for patients in need in India, Nepal, the United States and other countries.
The author's office answers questions about articles, research, speaking and collaboration. It cannot give personal medical advice.