Parasites live in other host organisms and depend on them for survival. Parasites that can affect humans include ticks, lice, and hookworms. Symptoms of a parasite infection in humans can vary widely.

Jenna Demmer is a writer and editor that specializes in health. She has covered many topics including infectious diseases, women's health, mental health, sleep, and more. She has written for more than ...

Intestinal worms are common parasites that live in the digestive system and can affect people of all ages. While many infections are mild and go unnoticed, some worms can cause discomfort, nutritional ...

Strands of parasitic worms found in dogs and cats are more likely to infect humans than other worm species, researchers said. monkeybusinessimages Getty Images/iStockphoto Strands of parasitic worms ...

A red, parasitic worm turned out to be behind the woman's wide array of symptoms. | Credit: Hossain, M., Kennedy, K. J., ...