Pinworm is a parasitic infection that lives in the human intestines, causing symptoms such as diarrhea, abdominal pain, and nausea. This intestinal parasite is particularly common in school-aged children and feeds on digested food. They are generally white or cream-colored and measure 5 to 10 millimeters in length. Pinworms use the human body as a host for shelter and nourishment. They reproduce and develop within the body, showing a tendency to spread to other individuals. When the severity or number of symptoms increases, they can pose significant health risks.