Yes, there is dengue in Medellín. The Aedes aegypti mosquito lives comfortably in the Aburrá Valley, and every year the city sees thousands of cases — with peaks during and after rainy seasons. Most cases are miserable but self-limited. A few turn dangerous, and the difference is knowing the warning signs.
How dengue feels
Symptoms start 4–10 days after the bite of an infected mosquito. The classic picture:
- Sudden high fever (39–40 °C).
- Intense headache with pain behind the eyes — very characteristic.
- Muscle, joint and bone pain (its old name is "breakbone fever" for a reason).
- Nausea, sometimes vomiting.
- A skin rash, often appearing after day 2–4.
- Profound fatigue that can linger for weeks after everything else resolves.
Dengue can be confused with flu, COVID-19, Zika or chikungunya. If you have fever in a tropical city, don't guess — get evaluated and tested.
The counterintuitive part: the dangerous phase comes when fever drops
Around days 3–7, when the fever finally breaks, most people are entering recovery — but this is precisely the window when severe dengue develops in a minority of patients. Plasma leaks out of blood vessels, platelets fall, and things can deteriorate fast. That's why doctors monitor blood counts through this phase, not just at the start.
Warning signs — go to an emergency department immediately if you have any of these:
- Intense, persistent abdominal pain
- Vomiting that won't stop (3+ times in 1 hour, or persistent)
- Bleeding from gums or nose, blood in vomit or stool
- Extreme drowsiness, confusion, or restlessness
- Cold, clammy skin; feeling faint when standing
- Little or no urination
What to take — and what NOT to take
This is the single most useful practical tip in this article:
- Yes: acetaminophen/paracetamol for fever and pain, within the daily maximum.
- No: ibuprofen, aspirin, naproxen or any anti-inflammatory (NSAID) — they increase bleeding risk when platelets are low. If your fever might be dengue, skip them until dengue is ruled out.
- Hydrate seriously: water, oral rehydration salts, broths. Dehydration is what turns manageable dengue into a hospital admission.
How dengue is diagnosed and monitored
- First days of fever: the NS1 antigen test detects the virus early.
- From day ~5: IgM antibody testing becomes useful.
- Throughout: serial complete blood counts track platelets and hematocrit — the numbers that flag severe dengue before it's obvious.
Most patients can be managed at home with hydration, acetaminophen and scheduled lab checks; the point of specialist follow-up is catching the minority who need more, early.
Protecting yourself in Medellín
- Use repellent (DEET 20–30%, picaridin or IR3535) daily if cases are circulating — Aedes bites during the day, especially early morning and late afternoon.
- Eliminate standing water at home: plant saucers, buckets, drains. This mosquito breeds in clean water in tiny containers.
- A dengue vaccine exists for people with previous confirmed dengue in some settings — whether it applies to you is a consultation topic.
- Second infections can be more severe than the first — if you've had dengue before, take a new fever even more seriously.
Fever and not sure what it is?
Fever assessment is one of the core services of this practice — dengue, malaria, chikungunya and beyond. In English or Spanish, in person or by telemedicine.
This article is educational and does not replace a medical consultation. If you have warning signs, go to an emergency department now — in Colombia call 123.