In short
Chikungunya spreads through the same daytime-biting mosquitoes as dengue and starts with sudden fever and severe joint pain. It is rarely fatal, but the arthritis it leaves behind can linger for months — here's how it differs from dengue and what actually helps.
Emergency if: Bleeding from the gums or nose, blood in vomit or stool, severe abdominal pain, cold clammy skin or drowsiness as the fever falls — these suggest severe dengue, not chikungunya, and need emergency care.
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01
How It Spreads and Starts
Chikungunya is caused by a virus carried by Aedes aegypti and Aedes albopictus mosquitoes — the same species that transmit dengue and Zika, which is why outbreaks of the three often overlap in warm, wet months. The mosquitoes breed in small collections of clean water around homes and bite mostly during the day.
Symptoms begin abruptly three to seven days after a bite: high fever, and joint pain that is often intense enough to make walking or gripping difficult. The name comes from a Makonde word meaning 'that which bends up', describing the stooped posture of someone in pain. A rash, headache, muscle aches, nausea and swollen joints are common.
02
Chikungunya or Dengue?
The two can look identical in the first days, and both are confirmed by a blood test (PCR in the first week, antibodies after). Clinically, chikungunya tends to produce more dramatic joint pain and swelling, particularly in the hands, wrists, ankles and feet, while dengue more often brings severe muscle and bone pain, pain behind the eyes and a falling platelet count.
The distinction matters for what to watch. Dengue can progress to a dangerous 'critical phase' with plasma leakage and bleeding as the fever settles; chikungunya very rarely does. Because they overlap, doctors usually test for both and check platelets and a full blood count regardless.
03
Treatment: Relief, Not a Specific Drug
There is no antiviral for chikungunya. Care is rest, plenty of fluids and paracetamol for fever and pain. Aspirin and NSAIDs such as ibuprofen are avoided until dengue has been ruled out, because they raise bleeding risk if the illness turns out to be dengue.
Most people are clearly improving within a week to ten days. Blood tests during the acute phase may show a low lymphocyte count, mildly raised liver enzymes and a rise in CRP; platelets usually stay higher than in dengue.
04
The Joint Pain That Stays
The defining feature of chikungunya is what comes after. In a substantial minority — more often in older adults and people with pre-existing joint problems — pain, stiffness and swelling persist or relapse for months, occasionally over a year, in a pattern resembling rheumatoid arthritis. Morning stiffness and symmetrical small-joint involvement are typical.
Once dengue is excluded, NSAIDs become the mainstay for this phase, with physiotherapy to maintain movement. For persistent inflammatory arthritis beyond about three months, rheumatologists may use short courses of steroids or disease-modifying drugs such as methotrexate. Tests for rheumatoid factor and anti-CCP help distinguish post-viral arthritis from a newly unmasked rheumatoid arthritis.
05
Prevention
Prevention is mosquito control: empty or cover anything holding standing water weekly (coolers, plant saucers, buckets, tyres), use repellents containing DEET, picaridin or oil of lemon eucalyptus, wear long sleeves in the daytime, and use screens or nets. Because Aedes bite by day, evening-only precautions miss the main risk window.
Vaccines against chikungunya have been licensed in some countries for people at risk, but recommendations have shifted as safety data have accumulated — particularly for older adults — so check current local guidance rather than assuming one is available or advised. One infection is thought to give long-lasting immunity.
When to act
Emergency — act now
Bleeding from the gums or nose, blood in vomit or stool, severe abdominal pain, cold clammy skin or drowsiness as the fever falls — these suggest severe dengue, not chikungunya, and need emergency care.
Same-day — call promptly
High fever with severe joint pain in an area with dengue or chikungunya activity, especially in infants, pregnant women, older adults or anyone with a chronic illness — get tested.
Routine — see a doctor
Joint pain and stiffness lasting more than a few weeks after the fever has gone.
Values mentioned in this story
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Sources
- Chikungunya — WHO fact sheetwho.int
- Chikungunya — CDCcdc.gov
- Chikungunya — MedlinePlusmedlineplus.gov
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