Catheter-related bladder discomfort (CRBD) is not uncommon in male patients under general anesthesia, and it may cause patient agitation and exacerbated postoperative pain. In this study, the investigators will enroll male patients undergoing elective colonal and rectal surgery with surgical duration of at least 2 h, requiring catheterization of the urinary bladder with urinary catheterization after anesthetic induction, and compare preoperative education with image illustrations combined with local tetracaine mucilage vs. local tetracaine mucilage alone in alleviating CRBD during the post-operative period.

Inclusion Criteria:

1. Patients aged 18 years to 75 years.
2. American Society of Anesthesiologists (ASA) physical status I, II.
3. Undergoing elective noncardiac surgery with urinary catheterization after 4.anesthetic induction under general anesthesia.

5.Duration of surgery more than 2h 6.Glasgow Coma Scale (GCS) score of 15. Ability to communicate.

Exclusion Criteria:

1. History of bladder dysfunction, such as over active bladder (OAB, urinary frequency: more than three times in the night or more than eight times in 24 h).

2. History of bladder outflow obstruction.

3. Neurogenic bladder.

4. Impaired renal function.

5. Coagulopathy.

6. Known allergies to any anesthetic agent.

7. Family history of malignant hyperthermia.

8. Impairment of communication or cognition.

9. Psychopathy.

10. Active participation in another trial where the primary endpoint follow-up is ongoing.

11. Unwillingness or inability to comply with protocol procedures.

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