Lymphatic Filariasis is a human disease caused by parasitic worms known as filarial worms. Most cases of the disease have no symptoms. Some people, however, develop a syndrome called elephantiasis, which is marked by sevvere swelling in the arms, legs, or genitals.
The skin may also become thicker, and pain may occur. The changes to the body can cause social and economic problems for the affected person. The worms are spread by the bites of infected mosquitoes.