A worm infection occurs when parasitic worms invade the body, often affecting the intestines. Common types include roundworms, tapeworms, and hookworms. These infections can lead to symptoms such as abdominal pain, diarrhea, and weight loss. They are typically spread through contaminated food, water, or soil. Diagnosis usually involves stool tests to identify the presence of worms or their eggs. Treatment often includes medications that kill the parasites. Preventive measures include practicing good hygiene, such as washing hands regularly and cooking food thoroughly, to reduce the risk of infection.