Dengue and black vomiting

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WHO dengue warning signs bleeding vomiting blood emergency clinical management

Black or coffee-ground vomiting in someone with dengue may mean internal gastrointestinal bleeding. This is a medical emergency.

Go to the nearest emergency department now or call local emergency services. Do not wait for a platelet count or for the fever to return. Vomiting blood is a warning sign of severe dengue and can worsen quickly, particularly as fever settles. The CDC dengue guidance advises immediate emergency assessment for vomiting blood or blood in stool.

Until help arrives:

Do not take aspirin, ibuprofen, diclofenac, naproxen, or other NSAID painkillers.
Avoid alcohol.
If the person is weak, faint, confused, very sleepy, has severe abdominal pain, cold/clammy skin, little urine, black stools, or ongoing vomiting, call an ambulance now.
Keep them lying on their side if vomiting or drowsy. Do not give food or drink if they cannot safely swallow.
Take dengue test reports, medication list, and note the timing/amount/color of vomit to the hospital.

Paracetamol/acetaminophen is generally the fever medicine used in dengue, but active black vomiting needs hospital treatment, not home management.

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CDC dengue clinical care severe bleeding hematemesis fluid management platelet transfusion 2025

What “black vomiting” means

Black, dark-brown, or “coffee-ground” vomit usually means that blood has been in the stomach long enough to be changed by stomach acid. The medical term is hematemesis when vomiting blood. Fresh, brisk bleeding may appear bright red; slower bleeding often appears black or like coffee grounds.

In a person with known or suspected dengue, this can indicate gastrointestinal bleeding, which is a feature of severe dengue. It requires urgent hospital assessment even if the person is awake or the vomiting has stopped.

Why dengue can cause bleeding

Dengue can cause several problems at once:

Low platelets
- Platelets help form the initial plug that stops bleeding.
- Dengue commonly lowers platelet counts, but the count alone does not fully predict dangerous bleeding.
Leakier blood vessels
- During the critical phase, plasma can leak from blood vessels into body tissues.
- This reduces the effective circulating blood volume and can lead to shock.
Clotting and liver effects
- Severe infection can impair clotting and affect liver function, increasing bleeding risk.
Stomach or intestinal bleeding
- Bleeding may occur from the stomach lining, an ulcer, or fragile blood vessels, especially if aspirin, ibuprofen, diclofenac, naproxen, alcohol, or steroids have been used.

Dengue is especially dangerous around the time the fever starts to come down, often days 3 to 7 of illness. A person may think they are improving while entering the critical phase.

Danger signs needing emergency care now

Seek emergency care immediately for any of these:

Black/coffee-ground vomit or bright-red blood in vomit
Black tarry stools, red blood in stool
Severe or increasing abdominal pain
Repeated vomiting
Fainting, dizziness, unusual weakness, confusion, agitation, or drowsiness
Cold, sweaty hands/feet; pale skin
Fast breathing, difficulty breathing, rapid weak pulse
Very little or no urine for several hours
Bleeding from gums/nose, heavy menstrual bleeding, or rapidly spreading bruises

The CDC warning signs specifically list vomiting blood and blood in stool as reasons to go to an emergency department immediately. Severe dengue can progress to shock and death within hours.

What the hospital will usually do

The treating team may:

Check pulse, blood pressure, oxygen level, urine output, and signs of shock frequently
Do blood tests such as complete blood count, hematocrit, hemoglobin, platelet count, liver tests, kidney tests, blood group/cross-match, and clotting studies
Confirm or reassess the dengue diagnosis and look for other causes of upper gastrointestinal bleeding
Give carefully monitored IV isotonic fluids if there is plasma leakage or shock
Use blood products if there is significant active bleeding or blood loss
Monitor in a high-dependency unit or ICU if unstable

Fluid treatment must be closely monitored. In dengue, too little fluid can worsen shock, but excessive fluid can cause fluid overload and breathing difficulty as the illness improves.

A common misconception: “Just give platelets”

A very low platelet count is concerning, but platelets are not automatically given just because the count is low. Preventive platelet transfusion has not been shown to prevent severe bleeding and may contribute to fluid overload. With active significant bleeding, clinicians may instead prioritize blood replacement and other treatment based on hemoglobin, circulation, ongoing bleeding, and clotting results. The CDC clinical guidance notes that packed red cells or whole blood are used for active bleeding, while routine prophylactic platelets are not beneficial.

What not to do at home

Do not take aspirin, ibuprofen, diclofenac, naproxen, mefenamic acid, or other NSAID pain medicines.
Do not self-start steroids or antibiotics for this.
Do not delay seeking care to repeat a platelet test.
Do not give food, fluids, or tablets if the person is actively vomiting, very drowsy, confused, or unable to swallow safely.
If vomiting or drowsy, place them on their side while arranging transport.

Paracetamol/acetaminophen is generally the preferred fever medicine in dengue, but black vomiting is not a home-treatment situation.

Black vomit can sometimes have causes unrelated to dengue, such as a stomach ulcer or swallowed blood from a nosebleed. However, it must still be treated as possible gastrointestinal bleeding until a clinician proves otherwise.

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