The investigators verify the reliability and practicality of the Chinese adaptation results of QoLAF-Q, which helps Chinese doctors better master the methods and techniques of quality of life assessment.

When the investigators conduct cross-cultural adaptation to verify the applicability of QoLAF-Q in China, the investigators also compare it with the cross-cultural adaptation results of other language versions of this scale. While verifying the reliability and practicality of the Chinese adaptation results of QoLAF-Q, the investigators also explore its differences, which helps Chinese doctors better master the methods and techniques of quality of life assessment, pay more attention to the physical and mental health of patients, improve the quality of life and satisfaction of patients, and provide a reference for the development of more scientific, effective, and practical scales.

Inclusion Criteria:

1. meeting the diagnostic criteria for anal fistula in the "Diagnostic Criteria for Anal Fistula (2004 Edition)", and being diagnosed through clinical examinations, digital rectal examinations, anorectal ultrasound, MRI, and other examinations;
2. being 18 years old or above;
3. having clear consciousness and being able to understand and cooperate to complete the questionnaire survey;
4. voluntarily signing the informed consent form.

Exclusion Criteria:

1. having other serious anorectal diseases, such as anal fissure, rectal prolapse, colorectal cancer, etc.;
2. having severe dysfunction of important organs such as the heart, liver, and kidneys;
3. suffering from mental diseases or having cognitive impairments;
4. having undergone anorectal surgery or other major surgeries that may affect the quality of life recently (within 3 months).

anal fistula patients who visited the anorectal surgery wards and outpatient departments of tertiary hospitals across the country