Worms that infect humans can be divided into three groups:

Roundworms, whipworms, hookworms
A patient with a mild infection may not show any symptom. However, some may experience itching around the anal area especially at night. Other symptoms include poor appetite which leads to weight loss, stomach discomfort, restless sleep and inability to concentrate. A worm passed with a stool may also be discovered by the patient or patients parents.