Ascariasis, caused byAscariasis lumbricoides, is one of the most common roundworm infections worldwide. While not as prevalent in the United States as in some developing countries, immigration from endemic areas has made the disease one that emergency physicians should be aware of. Presentation patterns are myriad, ranging from pneumonitis to intestinal obstruction and depend largely on the stage of the infestation. Once the diagnosis is made however, chemotherapeutic therapy is effective in halting the progression of the disease. Below, we review the presentation of ascariasis, the methods available to diagnose the disease and the therapeutic options available.