The most common intestinal parasite infection globally is ascariasis. It affects about 1 billion people worldwide. In the U.S., the most common infections are from protozoa, especially the …

May 4, 2023 · Parasitic worms live in and feed off living hosts. Learn about parasitic worms in humans, transmission, treatment, how to avoid being a host, and more.

Jul 22, 2025 · Intestinal worms are parasites that live in your gut and can cause symptoms like stomach pain, vomiting, and diarrhea. Eventually, the worms can pass through your stool …

Mar 18, 2024 · Praziquantel (Biltricide) can remove a tapeworm. This drug paralyzes the worm, forcing it to detach from the intestinal wall. It then helps dissolve the worm so it can pass …

Jul 20, 2025 · Roundworms (Nematodes) are characterized by their cylindrical, unsegmented bodies. This diverse group includes several species that are human parasites, such as Ascaris …

Oct 10, 2022 · Learn about the most common parasitic infections in humans. We explain their symptoms, how they are transmitted, and available treatments.

Nov 14, 2024 · There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites. Protozoa are microscopic, one-celled organisms that …

Find out about worm infections in humans, including what different types of worms look like, when to get medical help, and how to treat and prevent infections.

Sep 11, 2025 · While intestinal worms live in the gut and cause symptoms, there also are common non-GI signs and symptoms of intestinal worms. A rash is often the first sign of …

Aug 18, 2025 · We asked experts how parasites are transmitted, what it feels like to be infected, and what you can do to protect yourself.