One of the most common symptoms of a threadworm infestation is an itchy anus.ĭr. Threadworms are tiny parasitic worms that live in the gut of humans and are between 2 mm and 13 mm (1/2 inch) long. Common types of hookworms are Ancylostoma duodenale and Necator americanus. Richard Pearson from the University of Virginia School of Medicine says that hookworm infections cause an itchy rash along with digestive problems and respiratory issues. Hookworms live in the soil and can often affect people who walk barefoot, especially in developing countries or in places where animals live.ĭr. Symptoms are painful bowel movements with mucus, water, and blood. Or, not washing your hands after working with soil can cause a whipworm infection. The parasitic infection can happen by eating vegetables or fruits that haven’t been washed, cooked, or peeled properly. The infection occurs from whipworm eggs in the soil that get transferred to the mouth. The Centers for Disease Control and Prevention (CDC) say that whipworms ( Trichuris trichiura) are about 4 cm long and infect the intestines of humans. They feed on food in your digestive system and can cause vitamin and nutrient deficiencies. Usually, the eggs are ingested in contaminated food. Lars Grimmon on Medscape, can grow up to 35 cm in size and live for up to 2 years. A common roundworm that affects humans is Ascaris which, according to Dr. Tapeworms can cause digestive upset and weight loss.

Some types of tapeworms are Taenia solium (from pork), Taenia saginata (from beef), and Diphyllobothrium latum (from seafood). These flatworms cause a common parasitic infection that affect humans, especially in developing countries.ĭoctors from WebMD say that tapeworms can grow up to 30 ft (9 m) in humans! 1 They are contracted from eating undercooked food or food that has been prepared by an infected person.

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