Dengue is caused by a virus transmitted by the Aedes mosquito. It often causes high fever, severe headache, muscle and joint pain. In some cases it can lead to dangerous bleeding. The disease is common in tropical areas and outbreaks often occur during rainy seasons. There is no specific treatment, so management focuses on rest, hydration and monitoring the patient for bleeding or organ complications. Reducing mosquito bites and preventing stagnant water where mosquitoes can breed are important to control dengue.