Fluke infections are caused by parasitic flatworms known as flukes, which belong to the class Trematoda. These parasites typically inhabit the liver, lungs, or intestines of various animals, including humans. Infection occurs when a person ingests contaminated food or water, often containing the larvae of these parasites. Symptoms of fluke infections can vary but may include abdominal pain, diarrhea, and fatigue. Treatment usually involves specific medications that target the flukes, helping to eliminate the infection. Preventive measures include proper cooking of food and maintaining good hygiene to avoid exposure to contaminated sources.