A 62-year-old woman from Bogotá, Colombia, had chronic diarrhea for 4 years. The diarrhea was lienteric, occurring day and night, with mucus but no blood. She had no significant weight loss, abdominal pain, or other systemic symptoms, and no notable medical history. Initial stool tests showed leukocytes and blood but no parasites. Routine lab tests were normal. Due to the chronic symptoms and nocturnal diarrhea, a colonoscopy was performed. It revealed numerous mobile, white worms in the right colon, identified as Trichuris trichiura, causing friable mucosa. She was diagnosed with trichuriasis, or human whipworm infection.