Pinworm (Enterobius vermicularis) is a common intestinal parasite that is transmitted when microscopic eggs are ingested orally. The eggs typically spread through inadequate personal hygiene, contaminated food, drinking water, or surfaces. Insufficient handwashing habits, especially after toilet use and before meals, are primary routes of transmission. After ingestion, the eggs complete their development in the intestines and settle there as adult worms. Female worms usually lay eggs around the anus during nighttime, causing itching. As a result of scratching the affected area, eggs can transfer to fingers and under fingernails, facilitating person-to-person spread or contamination of clothes and surfaces. Situations such as changing diapers or direct contact with infected surfaces also increase the risk of transmission. Due to the microscopic size of the eggs, it is often difficult to be aware of the infection. Common causes and transmission routes of pinworm infection include: Inadequate hand hygiene, especially after using the toilet and before meals; Consumption of contaminated food and beverages; The habit of bringing hands to the mouth after touching contaminated surfaces; Close contact with infected individuals, especially among those sharing the same household environment.