Filariasis is a tropical disease caused by parasitic worms, primarily transmitted through the bites of infected mosquitoes. The most common types of filariasis are caused by the worms Wuchereria bancrofti, Brugia malayi, and Brugia timori. These parasites can live in the human lymphatic system, leading to swelling and inflammation. Symptoms of filariasis may include fever, pain, and swelling, particularly in the limbs and genitals. If left untreated, the disease can cause severe complications, such as lymphedema and hydrocele. Prevention focuses on controlling mosquito populations and using protective measures like insect repellent.