Intestinal myiasis is a rare condition caused by the infestation of the intestines by larvae of certain fly species, such as Sarcophaga or Musca. These larvae can enter the digestive system through contaminated food or water, leading to symptoms like abdominal pain, diarrhea, and nausea. Diagnosis typically involves identifying the larvae in stool samples. Treatment usually requires the removal of the larvae, often through medication or endoscopic procedures. Preventive measures include maintaining good hygiene and ensuring food safety to avoid contamination.