A bladder diary is a tool used in the field of nursing and urology to help track urinary habits. It is often recommended for patients experiencing issues such as urinary incontinence, frequent urination, urgency, or nocturia. The diary typically records the times of urination, the amount of urine passed, fluid intake, and any instances of leakage. This detailed record can provide valuable insights for healthcare providers to diagnose and manage urinary conditions effectively.