Filaria Symptoms - Signs and Symptoms of Filaria – Filaria or filariasis is an infectious disease caused by thread like worms called roundworms. Swelling of arms, breasts and legs are the major symptoms of filaria. This swelling is called lymphedema because of the name lymphatic filariasis. Filaria also causes damage to the lymph system which leads to fluid collection. These swelling also increases the risk of bacterial infection. In filaria, the scrotum become swollen, this filaria symptoms is called hydrocele.