Balantidium coli is a ciliated protozoan parasite known to infect the gastrointestinal tract of humans. While pigs serve as the primary reservoir host, humans can acquire the infection through the ingestion of contaminated food or water containing cysts of the parasite. Once ingested, the cysts transform into trophozoites in the colon, causing a condition known as balantidiasis. Common symptoms include diarrhea, abdominal pain, nausea, and fever. Severe cases may lead to dysentery and perforation of the intestinal wall, posing significant health risks. Diagnosis of Balantidium coli infections involves the identification of cysts or trophozoites in stool samples. Treatment typically involves antimicrobial medications, such as metronidazole or tetracycline. However, cases of resistance to these drugs have been reported, underscoring the importance of tailored treatment regimens and close medical supervision. Prevention measures focus on maintaining proper hygiene, ensuring the thorough cooking of food, and practicing safe water consumption, especially in areas with a higher prevalence of balantidiasis.