Chikungunya is a viral disease transmitted to humans by Aedes mosquitoes. It causes fever and severe joint pain, which is often debilitating and may persist for several months, or even years. Other symptoms include muscle pain, headache, nausea, fatigue and rash. Joint pain is often debilitating and can vary in duration. The disease shares some clinical signs with dengue fever and zika virus infection, and can be misdiagnosed in areas where these are common.