Both come from the same daytime-biting mosquito and start with sudden fever. Dengue is dominated by pain behind the eyes and carries a risk of becoming life-threatening. Chikungunya is dominated by severe joint pain and swelling that can last months but is rarely dangerous. Only a blood test tells them apart reliably.
Outbreaks of the two often run together, because Aedes mosquitoes spread both. You can even have both at once.
In the first day or two they look almost identical. The pattern separates later — and the distinction matters, because what you watch for is different.
With dengue you are watching for a dangerous drop in blood pressure around the time the fever falls. With chikungunya you are mostly managing joint pain that outlasts the fever.
Side by side
| Dengue | Chikungunya | |
|---|---|---|
| Mosquito | Aedes, bites in daylight | Aedes, bites in daylight |
| Fever | Sudden and high | Sudden and high |
| Standout symptom | Severe pain behind the eyes, deep muscle and bone pain | Severe joint pain and swelling, usually hands, wrists and ankles on both sides |
| Joint swelling | Uncommon | Common and often visible |
| Platelet drop | Often marked; watched closely | Usually mild |
| Danger period | Day three to seven, as the fever falls | No equivalent critical phase |
| Can become life-threatening | Yes — severe dengue | Rarely |
| Lasting effects | Tiredness for weeks | Joint pain and stiffness for weeks to months |
| Confirming test | NS1 antigen early; IgM from about day five | RT-PCR early; IgM from about day five |
When Dengue is usually the better choice
- Watch for the dengue warning signs: severe stomach pain, repeated vomiting, bleeding, drowsiness, cold clammy skin, very little urine
- Keep monitoring after the fever settles — that is when severe dengue appears
When Chikungunya is usually the better choice
- Expect joint pain to outlast the fever, sometimes by months — this is normal
- Keep moving gently; long complete rest makes the stiffness worse
- See a doctor if joint pain and swelling continue beyond a few weeks
Important
Until dengue has been ruled out, avoid aspirin and ibuprofen-type painkillers for either illness, because of the bleeding risk in dengue. Paracetamol is normally used instead.
This page does not choose for you
Which is right depends on your other conditions, your other medicines and your history. Ask your doctor or pharmacist — and follow what they say over what you read here.